Personal preference pretty much, I think. If you can get on with cages, they're lowest-effort as you can wear normal shoes with them. I can't be fucked with them, so I'd suggest an MTB-type cleat purely so you can walk around afterwards. Of those, I reckoned Crank Bros were the easiest to clip into, which is why I got them. Others will recommend SPDs, Times and so on. I suspect they all work well enough for most purposes - probably best just to try whichever is cheapest/easiest to get hold of and see what you think, then move on to to something which better addresses your particular preference. Much like bikes, tyres, shorts, sexual partners etc.
Personal preference pretty much, I think. If you can get on with cages, they're lowest-effort as you can wear normal shoes with them. I can't be fucked with them, so I'd suggest an MTB-type cleat purely so you can walk around afterwards. Of those, I reckoned Crank Bros were the easiest to clip into, which is why I got them. Others will recommend SPDs, Times and so on. I suspect they all work well enough for most purposes - probably best just to try whichever is cheapest/easiest to get hold of and see what you think, then move on to to something which better addresses your particular preference. Much like bikes, tyres, shorts, sexual partners etc.