I feel like every light vehicle in game has its pros and cons and it's mostly fine.
Luchs: great camo, 360+HP, murder machine when flanks infantry behind cover / not that good accuracy.
222: probably most cost-efficient unit in game, insane when vet 2 + scope.
Puma: great for AT, even in late-game, shuts down all light vehicles play / weak AI
Stug E: Amazing AI, great ability, 560HP / no turret
Stuart: trying to be AI and AT. General medicore light vehicles.
AEC: combo of weaker Puma and weaker T70.
T70: amazing AI, good AT, great recon mode, probably the best light vehicle in game (but some vehicles has to be the best) but 320HP (+repairs). Can be stopped by any Axis' lights.
Stuart and AEC is kinda meh but you need to factor in USF super-glue for Stuart and extreme fast tech if USF rush Captain. Same with Brit AEC can hit the field earlier than Luchs, T70 comes latest and OH at the time is 10-20 fuel away from P4/Ostwind so it got to have good AI/AT to make up for that narrow window. Also Stuart Stun shot is OP vs heavy tanks, AEC tread-break is kinda buggy but if it hit it's gg for your tank: stunning for 5+ second under fire from 6-pounder is no fun.