Yeah Raf, it'll all taste the same.
I think the main difference of the chimney over the baskets is that sometimes you might want all your fire to be spread into a 2 or 3 level heat range on one side of the kettle so that you have very hot on the fireside of the kettle, then a cooler heat towards the middle then nothing on the opposite side as that's where you want your seared meat to indirect heated.
This is much easier to organise with a chimney becuase you can pour the hot charcoal where you want it to be where as the baskets you can just slide them around where you want and are good for when you want the balanced Hot fire placed on eitherside and the meat in the middle.
I think the chimney heats up the coals alot quicker but not by that much in my experience, it's just the convenience.
The best thing with a chimney is,you can have hot coals on demand by lighting up more when needed, in fact you never really need to be without ready hot coals and cook all day by keeping the chimney stoked up.
Weber usually includes the baskets with most of it's kettle ranges these days and it's good to have them because they are useful for working on even balanced fires for calculated cooking.
cheers
Davo