You're a dinosaur.
But don't sweat it... Quattro Pro works just fine and, from my understanding, you can mix and match, to a certain degree, Excel and QP.
That being said, I learned (and if I may be so bold to say...) became a spreadsheet "expert" using Quattro Pro - for Windows (that would be simply "Windows," not 3.1...). I've used QP, Wingz (Macintosh), Lotus, Microsoft Works, Claris Works and even the Unix "ss" spreadsheet at one time or another.
But plainly, Excel has won the day, the battle and the war. I don't like to praise M$ software at all (I HATE M$ Word and don't use it, quite clunky and likes to "take over" my machine, Mac or PC), but Excel is the best spreadsheet around. Coupled with VBA and Active X and an engineer is pretty much unlimited.
However, if you are happy with QP and it serves your purpose and pays the bills, stick with it.