..the T67C is an underpowered fudge of an aeroplane not as well sorted.
I think that Genghis is a little harsh on the delightful handling T67c here, but he is right that this mark of Slingsby is a compromise, in that it has no inverted fuel or oil systems, or a constant speed prop. It's aerobatics are therefore limited to the same manoeuvers as the C150 Aerobat.
It has more power that the Cessna, so can just about maintain height in a series of manoeuvers, but it is not able to do this as easilly as the Bulldog, or climb to height as fast.
On balance, the Bulldog is easilly the winner in terms of aerobatic performance, and the basic manoeuvers are relatively easy, but, rather like the Cessna, you have to work harder in the Slingsby to get the best out of it, and I think that, of the two, it will teach you more as a basic aerobatic trainer.