Cassette Sram or Shimano?

this has probably been asked before but i couldn't see any other threads and the search wasn't that helpful.
basically after peoples thoughts on which cassette to go for; i'm looking at either the shimano XT M770 £32 ~ 256g (for the 11-32) or paying the extra for a sram PG990 £40 ~ 275g (for the 11-32)
now weight wise the XT is the obvious choice and it's cheaper, however there are loads of people saying it's weak and bends easily and that the heavier srams are more robust and whats 9g and an extra £10 if it's going to last longer
my current cassette (that came with the bike) is also sram and that's atleast 4 years old and as good as the day i bought it, so i've had a good experience from the scram, just wondered what people thought about the two brands.
cheers!
basically after peoples thoughts on which cassette to go for; i'm looking at either the shimano XT M770 £32 ~ 256g (for the 11-32) or paying the extra for a sram PG990 £40 ~ 275g (for the 11-32)
now weight wise the XT is the obvious choice and it's cheaper, however there are loads of people saying it's weak and bends easily and that the heavier srams are more robust and whats 9g and an extra £10 if it's going to last longer
my current cassette (that came with the bike) is also sram and that's atleast 4 years old and as good as the day i bought it, so i've had a good experience from the scram, just wondered what people thought about the two brands.
cheers!
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Giant Trance 3: http://www.pinkbike.com/photo/2673893/
Are the LX and SLX more robost? Watermonkey what do you actually run? And where do you ride in canterbury, as I work in canterbury (live in medway)
I've heard that Sram cassettes are disappointing.
CRC has some on 'flood sale' I got two chains the other day and they are perfect.
http://www.chainreactioncycles.com/Mode ... odelID=443
http://www.chainreactioncycles.com/Mode ... delID=6069
http://www.chainreactioncycles.com/Mode ... delID=5045
http://www.chainreactioncycles.com/Mode ... delID=5213
50% off all give or take... two Shimano and two Sram... Take your pick.
"When I see an adult on a bicycle, I do not despair for the future of the human race" H.G.Wells