Unfortunate the '88' has been classed as just that, the '88'. The different German 88mm guns were all very good, very, very good. It wasn't until the 122mm cannon on the IS-2 was brought to bear that they could match the Tiger one on one, and even then the optics on the Tiger were superior.
All the German guns were good, refined and very powerful. The 75mm cannon on the Panther had more penertration at certain degrees than the 88mm on the Tiger, you want the precise gun names, I can give them, but at the moment, I'd tired.