Clone Wars and The Mandalorian

I would recommend all of them since they’re all good (except possibly Resistance since I haven’t watched it), though if you were picking which to watch first it depends on what kind of shows you like. Do you prefer live-action or animation? Shows about Force users or non force-sensitives? Slow-paced or fast-paced?

First of all, of course you should watch the Star Wars shows! They are an integral part of the franchise and they add a lot the the characters, the world-building, and fill in the gaps between the trilogies. I would recommend watching all of them, maybe apart from Resistance, since it doesn't connect to anything and it's not a must-watch if you want to understand what's going on in the galaxy.

Here is the order in which I recommend to watch them all:

1. The Clone Wars

2. Rebels

3. The Bad Batch

4. Obi-Wan Kenobi

5. The Mandalorian (seasons 1+2)

6. The Book of Boba Fett

7. The Mandalorian (season 3)

8. Ahsoka

9. Andor (a prequel to Rogue One focusing on Cassian Andor)

10. Visions (non-canon)

I agree with @Loki-Is-Cool . You should watch all of the Star Wars shows (including Visions, if you want, but at least the canon stuff), even if they're not all the greatest. But at least watch The Clone Wars, Rebels, and Andor.