If you don’t want to fight, and only scan and hack, a Stratios is not the optimal choice for nullsec.
It is just much slower than the frigates already mentioned. Every Covert Ops frigate is a viable choice for the piecefull prey… errrr, explorer.
But if you want to be able to defend yourself but scan a bit less effective, the Astero might be the better choice.
It has one simple advantage: Offensive capabilities, which T2 scanning frigates just don’t have. T1 scanning frigates however do, but they can not warp cloaked and are less tanky than an Astero can be.
What help are offensive options when you just want to scan down things, you ask? It will make other players think twice before engaging you. Bombers for expample can usually kill T1 or T2 scanning ships rather easy but a full flight of light droens from an Astero should deal so much damage to a Bomber that it dies before the Astero.
Assuming the ships are fitted for scanning & hacking, the “foodchain” of what dies to what in a theoretical 1v1 situation is the following:
T2 Scanning (Covert Ops) Frigates & Intercetpors fitted for Scanning/Hacking
will die to:
T1 Scanning Frigates
will die to:
Bombers
will die to:
Astero
will die to:
everything bigger than a frigate that manages to lock you up before you can warp.
But be also aware that someone who might theoretically be killable by your current ship might have firends. And this changes everything. So the best bet is to not get caught in the first place. It’s a good idea to play very “introverted” and run away from any possible interaction with other players.
If I was you, I also would not try to enter nullsec through gates. Rather go through wormholes. (But do not take the one right in Jita or Perimeter, that’s very everyone goes)
And if there is someone else in local, always use dscan and have it setup to show scanner and combat scanner probes, so you know when someone might be looking for you.
Tipp: If you have probes on scan, an there are 8 of them within 3 AU of your current position, you can assume than the person handling these probes have found the site you are in. That is the time to be prepared to warp within a split second. (Having a celestial selected so you only have to click “warp to” can save your ship here)
Also don’t just bump into the cans by "Approach"ing them. “Keep at range 2200m” instead. So you can still loot the can, but you are far enough away to at least initially cloak up if someone appears near you. This can prevent initial locks. Keeping at range also should prevent you from bumping off from the can, which might slow down the time you enter warp.
If you managed to warp away from a hostile to a celestial, immidiately warp again, ideally to a safe spot. Skilled pilots will see the direction you where going when you didn’t manage to cloak and can estimate the celestial you where going to and follow you.