which algo is better for GPU?

WTF happened with this pool http://tty.coin-miners.info/

i have 99,5% rejected at suprnova groestl
at minep.it groestl something wrong with my hashrate

and they both find 0 blocks

win wallet???

script pool for tty

http://ttyscript.dgb123.com/?page=statistics&action=pool


Diff is

{
    "version" : 1000001,
    "protocolversion" : 70001,
    "walletversion" : 60000,
    "balance" : 0.00000000,
    "blocks" : 1984,
    "timeoffset" : -3,
    "connections" : 13,
    "proxy" : "",
    "pow_algo_id" : 1,
    "pow_algo" : "scrypt",
    "difficulty" : 0.05849005,
    "difficulty_sha256d" : 35672.53409525,
    "difficulty_scrypt" : 0.05849005,
    "difficulty_groestl" : 7.18129375,
    "testnet" : false,
    "keypoololdest" : 1405400643,
    "keypoolsize" : 101,
    "paytxfee" : 0.00000000,
    "errors" : ""
}