You should use 195/55/15 cos the diameter difference is only 1.27% vs 195/60/15 of 1.95%

In addition, you can't find performance tyre in 195/60/15. Only comfort.

All the performance tyres like PS3, Hankook V12, Goodyear GD5 are only found in 195/55/15. Tyres in 195/55 are also cheaper.

All depends on your priorities, performance or comfort.

Refer here for tyre calculator

http://www.1010tires.com/tiresizecalculato...p?action=submit