Generally for average or better performance, and esp re-sale most f/g production boats would be better bets than steel. Many steel boats are homebuilt (with the notable exceptions - in our area - of Waterline yachts and the Amazon line) and as such will be perhaps suspect in construction, fit and finish, and even design (or the execution of a design)
There's nothing like the confidence you can have in a well built steel boat, but the maintenance aspects will for the most part be more daunting although modern coatings have gone a long way to make things better with steel.
Heading 'round the world? to the Arctic? Sailing at night through debris fields? then a steel boat may make more sense..... for the average recreational sailor not necessarily so much.
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"