Good luck taking a broken car boot ratchet back to the snap on man if you're not a regular customer (or at the very least, know someone who is so you can get them to take it back for you).
There ain't no such thing as a free lunch, there's al ways a catch, with halfords, all you have to do is keep the receipt, with snap on, you've got to keep buying a bit of snap on gear.
Make no mistake, if you held a snap on spanner in one hand and a halfords pro in the other and said you can have one of these as a gift i'd chose the snap on in a milli second, no contest. If it came to buying one with my own money then it's a different matter, certainly if i was in the position of the OP. wanting some tools for DIY repairs to my own vehicle then i can't see any benefit in paying a premium for snap on.
If you were an apprentice starting out, and you took advantage of the finance scheme (which you pay for anyway regardless as it's built into the price), then paying 30 quid a week to the snap on man for tools that will earn you a living for the next 30 years rather than ****ing it up the wall or blowing it on some more tat to bolt on to your vauxhall corsa would be a good thing.
If you're paying on the nail there are plenty of branded tools like Beta which are comparable in quality and ergonomics to snap on at half the price.
Snap on is good stuff an it always seems to hold it's money well, but unless you're getting it a it the right money i don't think there's any advantage in it for the DIY guy as there's loads of tools which are either very nearly as good or very actually as good at a much cheaper price.
Anyway, for the snap on fan there a few bits and pieces on offer here:
SNAP ON TOOLS ------LARGE COLLECTION----- | eBay UK