Frankly, I don't think that going through a handful of cards from either manufacturer isn't enough to tell which one is better.
And by a handful, I mean less than a dozen cards of the same period/generation. Seriously, this amount is so low, ANY conclusions made based on it have an error marginal so high, there's no point in using the "experience" as a point.
Tired now, so I'll give you my 0.02€ - when a card manufacturer rolls out a new big number, grab a card of the previous series as soon as they get cheaper. You'll at least have some reviews based on which you can make an educated guess.
*EDIT* I mean it - don't speak about "my experience". Look at the big picture, perkele.