Zx6r (need advice)

Need advice i have 2 bikes to buy and dont know what is better
please advice
1. Zx6r 1300 (i was see this one) (30k) bike have lots on new things
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2. Zx6r 1350 £ (i did contact seller) (21k)
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the 1st 1 which as done 30k that would be the intermedium service after the big main 1 at 24 k offer him £1000 no more than £1100 as it as service history
2nd 1 which as done 21k its coming up to its big main service at 24k which could be a main engine strip down new shim,s etc etc mine was in for 3 days while waiting for parts & good job it was on a service plan which cost me nothing but i would say £350 to £ 500 & you can,t be sure what other things are wrong up to you tom but have a look at both
pete

Thx