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My place was flipped by a developer (bit of a weird one, it's a Jewish charity that has a massive {£100m+} property portfolio which it uses to raise funds). They refused to give us any warranty.
Before moving in I went round the house and tested everything I could (plug sockets, lights, appliances, taps, heating, windows, bath, shower, toilet, etc) . Basically finding the issues that would normally have been found by someone living there.
That gave rise to a few minor things that they fixed before we moved in. After we moved in, main things were some damp, boiler not working, a few leaking bits of plumbing, doors not closing after things settled, plaster cracking, bouncy floors leading to tiles shifting (I suspect that this will soon cause the tiles to crack).
Realistically, I'm not sure if a warranty would cover many of them. Lots of gradual issues that aren't definitively a problem or are only cosmetic.
The only one that is a real hassle is the damp. Some bits I've twigged the issue and fixed but others are going to take quite a while to work out how to resolve.
Assume this is a brand new house?
If so, you've got NHBC coverage on major things for 10 years (structural etc). The main thing I would be asking is what constitutes a snag - get a list of areas or items that are included and those that are not. Then I would check what falls into a grey area of not in snagging and not NHBC and see if you're happy with that.
I would also check what timings are attached. I.e, do they just come back at the end of the year and fix everything or will someone pop round every time you notice something?