ESPN Baseball Tonight was the first of several not too terribly successful ESPN themed sports games. It also illustrates the complexities of licensing. Since it was licensed by MLB, actual teams were used. However, since it was not licensed by the Players Association, no real player names were used.
SNES
This particular ad is showcasing the Super Nintendo and Sega Genesis versions of the game which were released in 1994 and 1995 respectively. There was also a Sega CD version released earlier in 1993 and a PC (DOS) version released late in 1994. Unfortunately, none of the versions were all that great.
Genesis
The game is a pretty traditional baseball simulation with single game, season and playoff modes, as well as a Home Run Derby mode. As far as baseball sims go it isn't terrible but it just isn't up to the standards of other baseball games around at the time. Controls can be a bit frustrating and while the graphics were decent, they weren't anything special.
If you really must try every baseball sim out there and want to give this one a try, you'll have to track down an original copy or go the emulation route. This isn't one that has seen a re-release. I think this is a case where the console version are a little better than the PC version but the differences between the Super NES and Genesis versions aren't significant.