The performance cannot be much different given the other parameters. The TB range has a significantly bigger cockpit CSA/volume than most common GA 4-seaters. Physics is physics, as they say...
Have you compared actual figures rather than the standard pilot forum reports from people who have never opened up the POHs?
They sold poorly after about 1990, due to being too pricey. It's a really nice plane but the market at that level is very price sensitive. In 2002, one school I was hanging around at the time bought three brand new Cessna 172s for about £120k each + VAT (from CSE) and the TB10 was priced at the time at about £160k+V, which was silly.
A new TB20 was £197k+V at the time (with prop TKS, KI-229 RMI, Shadin fuel flow, 3B prop) which made it a no-brainer for anybody in that market; the TB20 is vastly more capable. And I discivered years later that Air Touring sold some of those at the time for as little as £170k+V
The TB10 sold well in the 1980s, which is why you see very few newer ones around. Those you do see tend to be in a less than great condition because - unlike the common spamcans - the more "styled" car-like interior which contains a fair bit of plastic trim does not cope well with people kicking the interior with their boots