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Yeah this is key. They're both very different in terms of shape and size, so you would be better off just trying them both with your helmet. Check out Anon's new Comrade goggle too, it's similar to the APX in shape/size and is cheaper but doesn't have the quick lens change feature.
I'm so sick of people saying "their" goggle company has better quality lenses! Seriously people the top models of each of the top brands ALL have great lenses. Buying a goggle is all based off of fit and preference!
But what model did yOu have before? Because its not fair to compare a cheapo cylindrical lens with a mirrored spherical lens. The type of lens is more important than who makes it. I've used Smith I/o and I/oX and both had fantastic lenses, I actiallu liked some of the tints more than the fire iridium airbrakes I'm using now. However, I will note that Smith goggles consistently fit my face the worst of any brand.