Mejor bot Lane

Mostly you want to compliment your AD carry, but there's a sort of weapon triangle involved in botlane: Poke beats Kill beats Sustain beats Poke.

Poke vs kill: Poke lanes depend on wearing down opponents to either force them out of lane or set up for a kill at low hp. Kill lanes don't generally have sustain, so they lose the war of attrition as the poke lane harasses without getting in range of their wombo combo.

Kill vs sustain: Kill lanes rely on the aforementioned wombo combo to 100-0 their opponents. All heals now are fairly weak, and have to be repeatedly applied to have much effect on the hp of the carry. Basically, it doesn't help that you can give your carry another 150 hp when you're already taking 1000 damage in a couple seconds.

Sustain vs poke: Fairly obvious. Ever try to play support Maokai vs Soraka? Yeah, it sucks. The sustain laners can go where they please and don't have to worry much about getting zoned out. This one's more of a wash than the other matchups because it mostly depends on how much damage the poke lane can put down per heal, but overall the sustainers will be able to zone without taking much in return.

Don't take that all as gospel, of course, but there's a definite tendency for certain types of lanes to do well against each other. Also realize that not many lanes are pure poke/sustain/heal. Soraka can poke with her silence, Maokai can go for the combo with his root/knockback, Alistar can heal his laner. This triangle is also, by the way, a big contributor to how supports match up with carries - Soraka/Trist ends up being pretty bad, because Trist wants to jump on people but Soraka just wants to heal. Similarly Cait/Alistar, where Cait doesn't really have the burst to pull off kills most of the time.

TL;DR: Compliment your carry's style, but go for heals vs poke, poke vs kill lanes, and kill lanes vs sustain if you can.