The answer may surprise you.
I believe most here would say Tennessee, because of the way they mauled people, especially the first half of the season.
But from an objective, metrics point of view, the two teams are very close to each other.
Both will finish the season (even after Omaha, which neither made it to in those respective seasons) with THE most wins and THE best W/L record in the country. Both won the Regular Season SEC Championship and both won the SEC Tournament.
Both led the nation in Home Runs - though Tennessee hit more (HOWEVER, in a very “HR friendly” park that is 10 feet shorter in the power alleys and center field, and does not have the prevailing wind blowing in that Baum-Walker has). Tennessee also led the nation in ERA, while we had THE best pitcher in the nation (Kopps).
In RPI, the distance between Tenn (RPI .6256) and second ranked Stanford (.6036) is a whopping .0220; However, Arkansas’ RPI in 2021 was actually significantly higher (.6310), and the distance between us and eventual National Champion MSU (.6084, after they won in Omaha) was an even larger gap of .0224).
The main reason we came out a little ahead in the metrics? Strength of schedule we played vs. the Vols’ SOS this season. We not only had the best record in the country, but we also posted that record playing THE hardest schedule in the nation (Tenn SOS this season stands at 28th). IMO, that’s even more impressive a feat than having the most HR and best ERA (which Tennessee had this season).
We won EVERY series we played in last year (until the Super), while Tenn dropped a series at Kentucky.
And, even though we didn’t make it to Omaha, we had the best record against teams that were there (9-3)…even better than National Champion MSU ended up with (7-4)…including a sweep of MSU at their place.