I should probably clarify a bit. I'm pretty aware of the majority of fantasy lines out there (15mm fantasy has been a "dream" of mine for years, and I'm always looking around)…but I don't actually own any examples.
It's very hard to tell from each website, because they generally advertise as "15mm" no matter what end of the scale they are on. I've seen several comparison shots online, but they usually only include one or two examples. They give an idea, but not a great example of the differences, especially when different races are involved.
I am a fan of the older lines (I have tons of Irregular "28mm"). Irregular, Essex, and Alternative Armies(15mm UK) all look like they might be on the big side…but again, very hard to tell from pictures…and I like SOME of the races, but not others so much (much as I love Irregular, their Orcs and Goblins leave something to be desired…while their dwarves and Elves look awesome, for example).
I do have Blue Moon "15-18mm" wild west figures (as my only real reference right now). I also used to own several of the newer Splintered Light minis, which I thought were rather "small" and "thin". Many here may not own this boardgame, but I did paint up all my Battlelore 1st edition miniatures..which seem to be a sort of "off-scale" somewhere between 15mm and 20mm, but not really conforming to either. I wouldn't mind using this extensive collection in conjunction with what I purchase, which is primarily why I'm interested in "big and beefy".
I am actually looking for the physically beefiest and/or biggest ones out there (18-20mm would be fine with me…but not 1:72, before someone suggests Caesar or Red Box)) that actually have a extensive line (hence my interest in Irregular, Essex, and Alternative Armies specifically…although I hadn't considered Battle Valor, assuming they were true 15mm).
So, the next recommendation would be to buy several samples from different manufacturers…unfortunately, I'm in the USA, and shipping is usually (disproportionately) ridiculous, especially if you order in small quantities. Usually, it's only prudent to make substantial orders, so I have to make decisions beforehand based on the best information I have.
Thanks for the help.