Anyone that has not been subjected to actual slavery cannot speak about what it is like, or to compare it to other things.
Whether or not you have a difficult life is not the crux by which you compare life as a slave to the lives of free people. Not every slave has a bad life, and not every free person has a good life. It is a pointless comparison. The differences are in what it actually means to be a slave, compared to being free.
In slavery, you have no agency. You do not even get the illusion of having agency. You receive no income and cannot participate in the market system, excepting if your owner has granted you an allowance and access to a (predetermined) list of products. You do not get to decide whether or not you receive an education, even if education is free and available to people in your area. You do not get to choose what career you enter, how many jobs you have to work at the same time, and what, if any, breaks you get. You may have the ability to request things, or try to prove your worth to get a desired occupation, but your master will put you wherever you are needed. You can be renamed because your owner doesn’t like your name, is bored of your name, or is intentionally trying to deperson you. You can be married to whomever your owner chooses, or denied access to someone you care about. In some places, you can be used only for the purpose of producing children. You can be separated from your family and sold because it earns your owner a profit, or as a punishment. You can be punished with whatever severity your owner deems fit, for whatever crime he deems you having committed, or simply because he gets off on it. You can be killed on a whim. You can be forced into using addictive substances, or your life turned into a lie with TCMCs. You will be taught from birth, by your owners and by your parents (who were taught by their owners), that, true or not, you are inferior, lesser, something to be hated, and that you submit to others because they are biologically, culturally, and religiously better than you, and that you must be punished because you are not like them. And in all of this you cannot choose to leave if you do not like the conditions under which you are laboring, nor can you have any confidence that your owner, however good they may have been, might not change their mind on a whim.
There are good aspects to it, yes. I still sometimes miss my life in slavery, and I found free life very hard to come to terms with. A slave does not usually have to worry about being without a home, or without food, or without work. You do not have to worry about having responsibilities - everything important will be done for you. You have a good chance of being treated mostly well, physically - you’re someone’s property, afterall. And you can be guided into a proper, righteous living, doing God’s work, as true Amarrian slavery is supposed to be (but most Holders fail at the responsibilities they are given).
You can have a legitimately good, enjoyable life as a slave, and a worse life once you are freed. But while a free life is still bound to its own restrictions, to poverty, to poor work conditions, to cultural traditions, to abusive relationships, whatever, that life is still, for better or worse, yours. A slave’s life is not. What defines a slave is that a slave lives for their owners. Nothing you earn as a slave is yours. It is given to you, by the grace of your owner, and it can be taken away just as easily. You can have pride in being useful, and you can enjoy the life you are given, but you will forever live for others.
A slave is a slave, and no free person can compare themselves to that. “But the poor lives of free people!” is an insulting argument. “Yeah but what about…” is an insulting argument. It transparently tries to distract from the real issues suffered by slaves to talk about things that don’t ■■■■■■■ matter. Freepeople’s lives can have difficulties, but they are not slaves and their issues are not slaves’ issues. They do not belong in conversations about slavery.
This is not to say that there aren’t cases of people not “formally” in slavery who actually suffer under slavery. Certain family or romantic relationships can cross the threshold, ones in which anything you might earn is taken from you, your career and everything you might want is dictated by your superior partner, and even your free time and access to friends and the outside is dictated for you. Those are things I as a former slave can understand and empathize with. But most of the things people bring up in these kinds of arguments? No.
Most Holders sell off (or terminate) their slaves when it is no longer economically viable to keep them. Which can involve the separation of families and communities, or the death of the slave. Slaves are no more immune from being abandoned than anyone else, and they will be the first to go in such a situation.