The only thing I would disagree with is this. I think the best kits for squad leader are either support or sniper.
1. Sniper-He'll be hidden. He's powerful and can fire the opening shots to catch the enemy off guard. You can shoot at long range...no need to get close enough to die. Just let your squad keep spawning.
2. Support-Has armor (so he can take some more damage). Can give extra spamnades to his squad when they run out. Provides fire superiority to squadmates while attacking, and generally kicks the infantry's butts.
The reason I don't say medic is because what's the use of you going and reviving your men if you're going to die in a minute? Just make sure there's a medic in your squad and you won't have to be one yourself.