So a dimple lock would be more secure than a pin tumbler style? It has a 1 star TS007 rating whereas the Avocet has a 3 star rating
Better generally, yes, depending on price. A top quality pin lock may well be better than a cheapy dimple one, though.
Put it this way - I bought a top end chain and padlock for my motorcycle. Scored top marks on all the Thatcham tests and all the others, every magazine (back when we had printed words!) was raving about it, yadda yadda. It's still highly rated even today and will guard against most theft attacks... but I can still open it in under three seconds with a paperclip.
As mentioned, most burglars will look for other ways in, so it depends on what you want to guard against. You can have the best lock in the world, but it counts for tosh if your hinges are rusty old cack and the door frame is rotted wood...
Not meaning to cause you any undue worry or anything, but if they want in that badly, they'll get in, even if they have to crowbar the door in or smash your windows. All you can do is hold them up and make it more hassle than it's worth, so they go find an easier target... like spiteful Mrs Mangel at No 16 who left her window wide open!!
Just get the best you can afford.
Perhaps consider an 'anti-bump' model - These are more bump-resistant and usually more snap/drill/force resistant too. Yale do some reasonable ones around the £20-25 mark.