I love the look of some OPI polishes, but to be honest, I haven't purchased any. By and large, the price of OPI in Canada has put me off for years. They seem like good polishes and I will likely give them a chance eventually but for now, I have no experience with OPIs.
Having said that, I now own two MAC colours (one purchased, one was a gift) and I don't have application problems with either. MAC's discontinued Vino n/p is my favourite shade of red. And I'm currently on the Dry Martini bandwagon.
China Glaze is my go-to nail polish. I've never had a problem with application (aside from one, almost metallic, colour that applied a bit streaky.) I love the formula (I'm sure I've encountered both the old and new formula by now and neither has posed a problem), I love the colour selection and I love the price it retails for online or at Sallys.
I am likely not as fussy about polish as some of you more avid collectors. I rarely have a problem with my polish chipping, regardless of brand, unless I do a hurried application job. Polish wears on me well and my nails will often outgrow its polish (cuticle gap) before I see much tipwear.
China Glaze is still my fave though! I bought Wagon Trail in the summer and I cannot wait to wear it. It's a beautiful shimmery forest green with a hint of gold. Perfect for fall!