I understand that 6.4:1 is a good all around ratio now im looking to buy the lews speed spool LFS so will the 6.8:1 also work for a good all around ratio thanks

Yes that'll still be close to 6.4:1.  Don't worry about those numbers as much, look at IPT

Ratio wise these are identical in practical terms. I don't know the line retrieve IPT but doubt they are significantly different. The only application where ratio / IPT make a noticeable difference is deep cranking (DD22's etc) and a few other high resistance baits. For these a "Cranking" reel with a ratio of 5.x:1 or IPT in the 18-20" +/- range  make fishing these baits a little more enjoyable. Some people prefer a a faster reel for picking up slack when jig fishing but that's more of a preference than a mechanical advantage. 

greatly appreciated

I actually would find 6.8 may be slightly more versatile than a 6.4.. Basically its only a 1/2 turn more of the spool so its not that much. Anything 6.'X' will be fine.