Last year I got a new pair of Smith I/O goggles and I've come to the conclusion that they just don't fit my face properly. I think they're too small. The arch of the frame doesn't seem to go all the way around my face, so the goggles sit slightly in front of my nose rather than on it. So every time I exhale air gets into them and fogs them up.
Last time out I tried on a pair of I/OX goggles at the shop, which are slightly bigger and fit my face way better. While I can't try them before I buy them, they feel like they'd form a much better seal against my face (nose especially) and probably eliminate the fogging issue. I'm thinking about picking up a pair my next ski day.
I haven't done much research into other brands of goggles, so I'm curious about any competitors that could be as good as the I/OX for the same price or less. Essentially I'm looking for a large pair of goggles with a spherical, interchangeable lens. I do a lot of night skiing so swapping lenses from day to night is key. My local shop has a good selection of Anon, POC, and Electric goggles but the ones with spherical lenses don't come with a second lens like the Smiths do. I'll try on some others next time I'm there and go with what feels best, but so far the I/OX seems like a pretty sure bet.