Picked up my Sar9 yesterday now looking at ammo

Looking at buying ammo and ended up seeing the paragraph for recommended ammo on SarUSA. What is everyone shooting in their Sar9 gen 1? Local gun store sells a very limited selection of 9mm, mostly steel casing (bulk) and Sellier & Bellot FMJ 115grain.

Ended up buying 4 boxes of the Sellier as the owner said it would work just fine but now worried I made a mistake. Plan to buy a few hundred more 9mm online but now wondering what I should get for hollow points?

I’m afraid to get the wrong type of ammo and plan to buy Winchester NATO 9mm but what is everyone’s recommendation on defense ammo? Thought about getting 124 or 147 grain for JHP. Was hoping to get 147 but if that won’t shoot well out of the Sar9 I’m fine with a different grain.

What’s everyone’s opinion on this?

https://sarusa.com/faqs/#:~:text=We%20recommend%20shooting%20NATO%20Spec,firearm%20will%20void%20the%20warranty.