Just choose a chicken within a broad catagory which meets your basic criteria then choose the breed on the basis of what takes your fancy and robustness to British weather unless you want to molli-coddle them. Here's some broad selection criteria I compiled a while ago.
"If you want lots of eggs and some interesting pets and aren't interested in the social side of chicken keeping choose hybrids. They lay lots of eggs particularly in their first 2 seasons and make good pets too. However if you want to keep chx as more of a hobby or want spectacular looking birds, or bantams, or want to breed birds, or engage in the social side of breed clubs, or get into showing etc then choose Pure Breeds.
It's like the difference between mongrels and pedegree dogs really. Most people start with hybrids because they want eggs and hybrids are readily available from garden centres and breeders. Once they get to know a little more they want to get more into the hobby angle and want specific Pure Breeds.
Hybrids are created at each generation from breeder stock to have specific laying qualities though these days looks and egg colour are also bred for. However hybrids aren't standardised and don't breed to type and many small breeders have their own specific types which can't be replicated abcross breeders. You ONLY get hen birds as cocks are useless being no use for breeding from and no use for the table either so are culled early as soon as sexed. Pure breeds are standarised and breed true to type. Both cocks and hens are bred as adult birds. The type standards are set by the Poultry Club of GB. Pure breeds can be layers, utility or purely showing breeds. Utility are useful for laying or the table, layers for eggs like hybrids but not so prolific and usually lay for a few more seasons than hybrids. Show breeds are purely for fanciers for looks, breeding and showing alone. Most pure breeds have a bantam version which are useful if space is an issue. They can be good layers but frequently they are show birds only. Although I believe there are bantam hybrids I can't personally understand the rationale for these as they will only produce small eggs and are no use for showing or the table.
So there you are in a nutshell. It's horses for courses and it's what you want them for. There's no best buy option!"
HF