The Ranger 29 is an encapsulated keel... ie the keel form is part of the mold and the ballast fills that cavity.. no keel bolts, so very unlikely any 'wobble'. She's a sweet sailor, the Mull Rangers, esp the cruising ones (23/26/29/33) are surprisingly slippery and sail well to their ratings. The racer cruisers (28/32/27) are more extreme IOR influenced hulls with a lot of tumblehome, bolt-on keels and more extreme rig dimensions (short E) and tend to be the typical death roll machines comparatively speaking.
Our son's 'first boat' of his own was an R29. It served him and his family well, and they did well in beer can racing. Since moved up to a C36 but still he has a 'soft spot' for #1. In the '80s my brother owned an R28.. we had fun with that boat but she was 'sailed hard and put away wet' as they say.. bit of a wild ride in a breeze.
OTOH the T30 seems to be universally well-regarded, so I'd say it comes down to which one simply 'feels' more right when you're on board.