It's a hard comparison. They are both very good, in wildly different ways.

B5 is much more character driven and more of a slow burn that sets up a big payoff in the later seasons that has permanent world-changing impact. It was really ahead of its time, closer to something like Game of Thrones than anything else at the time.

TNG feels more static, even the "big events" don't really change the world all that much in the next episode, except Tasha Yar being written out of the show in season 1 causing Worf's head to shrink in season 2 or something I guess. It's a mystery-of-the-week show, you know what you're gonna get and you know it's good. No complaints, but also nothing mind blowing.