I would say that it's a easier for UT to make the Elite 8 in basketball than to make the championship tournament (OK City) in softball. But that's Elite 8, not the Final Four. If you are comparing the WCWS and the Final Four, they are probably comparable.
If we assume that both our basketball and softball teams are good and would host NCAA games, the BB team would play two easy games AT HOME, then have to win the Sweet 16 game to get to the Elite 8. Last year we played Boise State and Pitt at home to open the NCAA tourney--both easy games against unranked opponents (though of course we made the Pitt game tougher than it should have been). We then played Gonzaga in the Sweet 16. We eeked out a victory and made it to the Elite 8, and then were beaten. So if we're good enough to play home games to start the tourney, we only have to win one (sweet 16 game) to get to Elite 8, and that is usually against a solid but not spectacular opponent.
In softball, we played the regional tourney at home with three opponents, two of them average and one pretty good. We ended up playing and beating a solid but not great Utah team in the best-of-three regional final. We then played a very good fla state in the super-regional, best of three, and somehow won that. We are helped in softball because it's double elimination--gives the favorite another chance to do its thing--but on the other hand you can run into great pitching from just about anyone in softball.
Importantly, SEC softball has become brutally competitive--much more so than SEC basketball. So from now on it's going to be increasingly difficult for us to put together a great record and host a super-regional, IMO. You've got to have an excellent team to finish in the top 3 in SEC softball nowadays. We managed to do it last year without having a great team thanks to the wins we scratched out in the SEC tournament, but the conference is tough. In basketball, the league still isn't nearly as rugged. South Carolina is now very good, and kentucky tests us--but mostly because of their style and not their talent. LSU can be good, but that's about it. Everyone else is meh.