All depends what your main goal is.
Making most ISK/hr? Marauder, point.
Paladin is noticably superior in Amarr Space (facing mostly Sansha/Blood Raider).
It’s still on par with the Kronos even in Caldari/Gallente Space, depending on the mission sometimes Kronos is faster, sometimes Pala.
Vargur excels in Minmatar space where the opponents are mostly Angel Cartel. The high tracking and the ability to do almost pure explosive damage really shines.
Pala and Kronos come close, but can’t overtake the Vargur here.
Golem is slowest in most missions, no matter where you run your missions. (Sorry Caldari, delayed damage just sucks. ). However, the Golem is very convenient to fly and fit, even with pure T2 equipment. And it’s not that far behind in most missions, it just can’t take the first place anywhere.
If you want to have more action but still print your money quickly: Machariel / Bhargest and flying “on the move”.
If you want to be lazy and just run missions without paying much attention to efficiency: Passive Recharge Rattlesnake with Cruise Missiles. Drones grind through anything, CMs fire over the whole grid, NPCs never bite through the buffer tank. Nirvana Set recommended. You will also be an awful gank-target, getting easily more than 700.000 eHP with overheat.
If you want to be flexible, have action and still a challenge, while accepting that you won’t get the most ISK/hr, use a HAC/T3. They can run all L4s, sometimes you may find yourself in a situation where you want to overheat and you won’t reach the speed of a Marauder/FactionBS, but it’s more fun for sure.
If you want to hurt yourself: Assaultfrig/T3Destroyer/Draugur.
Good luck.