1229.
Not to say a 1224 won't sound good, but the 1219 and 1229 decks were some of the best Dual made.
If you're looking at a 1229, be sure to check "single-multi" lever at the base of the tonearm. If it's frozen DON'T FORCE IT!!! You could break a very difficult to replace part.
If the lever is moving freely but the tone arm doesn't move with it, that difficult to replace part is already broken.
The 1229. No contest. I owned a 1229 for many trouble free years. One friend had the 1224 and always commented that the 1229 was quieter than his 1224. When I upgraded I sold the 1229 to him.
Playing the PE got me interested in idler turntables. I'm looking for a fully serviced Dual 1219 now.

Grabbed a 1229 recently. Came with a Shure Premier cart...basically an M95. Unknown hours on it.
It sounded good, but I was getting a fair amount of IGD.
Switched to a Audio Technica at-15xe. Major improvement in sound and tracking. IGD is gone.
I forget how good that AT 15XE is. It kicked up sound quality a notch or two. It seems well matched for the Dual.[/QUOTE
The AT line matches up with the Dual 1200 series. Have an AT11 on my 1219 replaced a tired Shure M91ED. Sounded really good. It was not too bright. The Shure stylus was gone and new LPs were noisy.
Found 2 EVGs. Replaced the Shure stylus. These carts are close. Both mounted to Best sleds. OP enjoy!
Eric