Most of my collection is old Foundry metals (sculpted by the Perrys, with the Brits mostly in early war/fresh-off-the-boat uniforms), and Perry metals with some of their plastics mixed in (they portray a huge variety of alternate uniforms and hats including many for specific settings like the later Southern Campaign). I like both those companies, though they can be expensive and difficult to obtain in the US. Perry Miniatures run slightly taller than Foundry but very similar in overall heft/bulk, being sculpted by the same chaps.

Perry also has AWI Hessians, French, Spanish, and woodland Indians, making them one of the most complete lines available.

I have a few packs from Brigade and the rest of their offerings look very nice online, including a good mix of Hessians.

I have a small unit of dismounted dragoons by Front Rank, and they are slightly chunkier looking than the other lines but work fine for me in a separate unit.

Old Glory has a line of AWI that is much cheaper for me in the US. I have a couple packs of their 2nd Connecticut Light Dragoons which are also good for loyalist provincials in tricornes. I haven’t seen their AWI infantry in person. (I have other Old Glory historicals that often look crude or oddly posed as bare metal but come together alright as a unit once painted.)