I have 5 brands in my nail varnish stash. OPI, Nails Inc, Chanel, Deborah Lippman and Nubar. The majority are OPI as I think they make for the best application, nothing beats their brush, and this is why they are my favourite. For longevity they are all similar, I don't expect a nail varnish to last more than 3 days. I always base and top coat and currenly use OPI ones.
Chanel Peridot is the colour I get most comments on, even my dad said he liked it!
Deborah Lippman makes the best glitters, Ruby Red Slippers and Across The Universe are my favouties.
Nubar are cruelty free and have no formaldehyde, toluene or phthalate, and the colours are beautiful, I am currently wearing Raspberry Truffle which is a rich chocolate with red shimmer.
And my last word goes to Nails Inc who imo are the worst. The colours are pretty yes, but the brush is horrible, short and stubby and the lid is awkward to hold as it's too chunky. They also stain my nails even with a base coat. I rarely wear these and will probably throw them all out.