So i have my AV mana turret. HOWEVER now i'm thinking about a AA unit... And i'm torn between Skyguard and Striker.
The skyguard is obviously the go to mobile AA platform...
BUT
It's also a far bigger target for ESF/Liberators to blow up.
And it has a cooldown... and cost mech res.
I run a Skyguard frequently, with stealth for defense. ESFs never get me unless I am getting tag-teamed, end even then I can frequently hold off two. Even when they sneak up on my rear, I can survive the barrage, pump enough rounds into them to disengage, and heal the vehicle back to a safe buffer (I have nearly full repair certs) before they can return, and if they do they're toast. I feel awful for Liberators, they are just so visible from so far away that I can chase them off way before they can put accurate rounds on me. They still get Dalton kills on me, but only if I'm a) snoozing and let one get close or b) in a massive furball where there's just too many targets and one gets close enough. Overall, the Lightning is fast enough and the Skyguard deadly enough that ESFs and Libs are not a serious problem so long as you're watching the sky, and not say, doing endless donuts trying to run over a medic or something.
What are a problem are Harassers. Most vehicles you can get away from easily, but a Harasser vs a Skyguard is just a bad scenario. I do my best to stick around with either infantry or vehicles that can fend them off. HEAT/AP Lightnings are also nasty if you let them get near. I've maxed my radar so I can see vehicles approaching; that allows me to get a head start away. Generally, survivability in a Skyguard IMHO is high enough that it easily surpasses the cooldown/resources issue, as long as I'm not taking stupid risks with it.
Anyway, I've never used infantry AA. The main reason I am not interested is the mobility issue - AA empties the skies pretty quick sometimes, and I liked that the Skyguard is mobile enough that I can move with the fight and quickly go hunting elsewhere once the sky is empty, or respond quickly to other nearby conflicts. I can ditch it to take flags or mine a flag, or lay down a turret for AV. I can repair other vehicles I'm running with. Its really versatile. I don't play in squads or units so that fits my play style; someone in a unit is more likely to have the ride problem solved.