Armchair
A Citabria / Decathlon you can pretty much see over the nose. It also has a reasonably long fuselage, which makes it more stable on the ground. It has a fair size cross section, so its draggy and therefore relatively stable in speed. It's undercart is also reasonably compliant and it has a lot of ground to wingtip clearance.
By comparison, a Pitts has limited forward visibility - even in level flight. On final or taxying the "blind spot" would be possibly a 120 degree degree arc. It lands possibly 20 knots faster than a Decathlon, has very stiff undercart (especially the spring steel undercart mod), short fueselage and limited ground to wingtip clearance. Especially in a single seat Pitts you cannot relax at all until the thing is in the hangar.
The cub / supercub is even easier than a decathlon. A J3 cub with a final approach speed of about 40 knots allows a fair bit of time to sort things out. A Pitts is over the fence at maybe 80 knots, so you've got to be on top of the game.
A tiger has about as good forward visibility as a Pitts, except you can look down beside the fuselage more easily and use that as reference. And its slow and progressive with a lot of feedback in the controls. Its a joy. Taxying a Tiger is probably hardest. Followed by a cub or early Citabria with heel brakes. The Pitts is easy to taxi, its just unstable. If it gets away from you it goes pear shaped in a heart beat. Literally.