Nice looking cars! I would strongly suggest investing your time into the better condition, less rust option.
As for track-ready, I think it really depends on your goals. Unless you're going for an all-out rollcaged dedicated track car build, really any car in good mechanical shape with maintenance kept very up to date will be fine to use for some autoslalom or HPDE days. I would say focus on making a plan to have a very reliable car with wear items replaced in excellent mechanical condition, and then track use shouldn't be an issue.
Key words: make a plan