2080 ti is ~15% (10-20%) more fps than 2080 super, and costs 35-50 % more, if this is what you're asking about. Depends what brand, model and the seller, etc, ofc.
While before one 'd say that ''if you are an enthusiast, then go to the max (Ti)'', or another ''2080 Super is better perf. per dollar (value)'', right now it's different and mb don't hurry for either.
3080 is already there I think, 3070 comes on 15th october (maybe) and 3090 soon has to be there. They have, or, will have Ti-ones, too.