Buying recently rebuilt or fixing one up?

I am currently taking flying lessons. I would like to own my own
aircraft and have been considering various options.
I am currently training in a 152 and I think a 150 or 152 would be a
fun first plane to build time with.
The 150/152's that appear to be in good condition seem to be in the
35k range while ones that seem a little more used up are in the 15-20k
range.
I am just wondering if it would be better buy a good condition ready
to fly aircraft for 35k or go for a less expensive one and put 20-25k
into getting it fixed up.

My thought is with the fixer up route, I would have a better idea of
what I am starting with once it is fixed up. I may not know with one I
would pay 35k for and fly away with. The plan would be to fly the
aircraft for a few years and then trade up.