One of the problems with electric shaving - and all shaving, actually - is the arbitary and subjective nature of what constitutes a 'good' shave. 'Good' might mean quick or safe or close or it might actually be more about the shaver: easy to manouevre, long battery life, mod cons like cleaning stations, cheper replacement parts etc. The point is that there are lots of 'goods' and your best is the one that works for you. This is why if you read 50 websites which compare a range - and it's normally the same range, give or take some outliers - they all place them differently, or at least differently enough to show variance while still being within the 'best' category. For people who want definites - and this is almost everyone in this thread - that provides an unwanted complexity because 'NO VARIABLES WHAT IS THE BEST THING?!' is less appealing than 'OK, I BUY THIS BECAUSE IT IS BEST'
Read lots of reviews, talk to some (good) sales people, maybe even use the experience you've previously had and then buy something and see how it compares to those things. If you need to, finesse from there, but very much like wet shaving you might quickly find that you get to slim improvements at the expense of substantial mental thought and time invested and, well basically, don't go down the rabbit hole unless you need to would be my advice.
Really short version: sometimes 'good' is good enough and 'best' is always elusive.