I've owned both and flown them cross-country, with perhaps 120 hours in an LS-4 and 500 in an ASW-20. If you have to land in short spaces, the 20 is the best choice hands down with its combination of strong flaps and spoilers. IMHO, the handling problems of the 20 are overblown, provided that you keep the CG in the right place and don't deploy landing flap until you're on final.

The LS-4 is unquestionably a sweet-flying ship.

I agree with other posters - I would take a nice LS-4 with good instruments and trailer over a beaten-up 20 with ratty trailer! You need to look at the whole package, but either ship could work for you.

Mike