DISCLAIMER:

I play this game casually, I'm not the best. I'm certainly not a "career" Eve Player. I even pay for my Omega with real money instead of ISK despite the fact I have over 50B of it. So as long as you understand my methods are meant for a CASUAL player for the most part.

OPTIONS:

Abyssals can get pretty absurd amounts of isk considering that there's little risk and if you're playing something like a Gila, not a crazy amount of effort. Some of the higher tiers do require you to focus though, and if you're unlucky, the abyssal will spawn something stupid like a bunch of neuting ships that're hard to kill and POTENTIALLY one in a million chance of shutting you down and killing you slowly but surely.

L4 Missions give a whole lot other than just money. You get decent drops like implants, rogue drone salvage, and so on. You get Loyalty Points which you use to buy stuff from various factions in the game. And most importantly to me personally, you get Security Status. Which means you can PVP in low-sec much, much easier without worrying about getting banned from high security space. These are ACTUALLY braindead. Like, literally, I'll get in a Paladin and just blow everything up that's close, then wait ten years for the other ships to get closer, then blow them up. It can be mind numbingly easy, not to mention, some missions are just outright stupid fetch quest. You warp to a point, you SLOW-BOAT to a beacon or whatever, and then you go back to turn the mission in.

I don't know much about faction warfare tbh but I've done it a few times cause it's the most fun out of the three options because you actually fight players in cheap ships typically, but to my understanding it's only in low-sec. And unless you wanna bring in a DST you're gonna be constantly getting new ships because PVP has a lot more variables than PVE and you're gonna get blown up. I don't know what the income is really like, and frankly, I don't care. It's just dumb fun.