best tyre size

[Optispart]

as siad in the title whats the best tyre size for a set of 15" alloys?

 

[jowley]

195/45/15

 

[Optispart]

cheers

 

[1.3GX]

195/45/15

as above especially if intend lowering.

 

[g2oo8]

do these have any advantage over the 195/50/15 other than being a thiner tyre ???