Oh, uh
If you like robots at all
Gundam 08th MS Team is pretty much the best hting to ever come out of that franchise. 13 eps. Excellent.
The other "best thing to ever come out of that franchise" would be Gundam 0080: War in the Pocket, which is often aired as 6 eps but in truth is basically a movie. Definitely the most emotionally mature version of the series.