I think it pretty much all comes down to personal preference. You'll find a lot of people disagree on this.
As such, I can't tell you what to get. But I can give a little run down on my experiences.
At home, my mainly used cordless tools are Ryobi. I have the older ones. I do like these, they have lasted me a good while and been used regularly. The batteries are now about knackered which brings me onto my main gripe; the price of the batteries. Yes, they can work on multiple tools but I find the cost hard to swallow when LiOn prices should be much lower by now with the advances in technology and the increasing use of them.
At work I use Makita LXT. They have lasted nearly 6 years and been very well used by students (I work in a construction college) whom give them a good bashing seems as they are not theirs to worry about. The original black and white ones have lasted well but the newer green ones, 6 of them, have all failed within 2 years with less use than the others (3 of them failed within 4 months). I know they are supposed to be internally the same but they certainly don't perform like they are. Seem to have less power and overheat much easier.
I have used Dewalt and personally don't rate them very highly at all. I think they are over priced for what they are.
For home I'm looking at some Erbauer 10.8v ones. Pretty cheap (screwfix onw brand cleverly disguised), batteries are MUCH cheaper but still last surprisingly long and they perform almost as well as the 18v ones.
Well, that's my input anyway.