As others have made clear, “Best” is a term relative to how you will use the gun. Otherwise, Mr. Weihrauch would just make one gun, right?
If you are undecided, I would strongly suggest the HW 30/R7 family in .177 cal for your first Weihrauch. It’s light, easy to carry, and easy to shoot well due to the low cocking effort and recoil. It’s a rifle you can enjoy shooting for hours at a time, and share with other shooters of all ages and sizes. And you may be surprised to find that its power level is really just fine for 90% of the legitimate airgun jobs out there.
Springers at this power level are a total delight to own and use. You will always have a spot in your “airsenal” for the HW 30, even if you later decide to add some more powerful models.