I personally prefer the Scout, the increased mobility and fuel reserves ability lends itself to most encounters better than the "Camo" ability of the infil in my experience; it's not exactly hard to tell where they are when they start firing. If anything, the Camo is nice for getting out of a clusterfuck situation when you can get lost amongst the chaos.
Though I do love the HEAT cannon, it just takes some getting used to. After having seen the stats, mixed with in-game experience, it doesn't seem to really necessitate a charge-up aside from an opening salvo for obvious reasons. The charge up time doesn't make up for a +20 damage mod imo.
Edit: GG last night, Brando; need to get more people from the boards in on the action.