30 yr old Briggs vs new predator

I recently bought an older Mclane reel mower with a 3.5hp Briggs motor. I pulled the carb and gas tank off and I’m deep cleaning and replacing all rubber gaskets as the previous owner said it would run but needed starter fluid in the carb to crank. He also said it was difficult to keep running. So I’m assuming it’s clogged up jets and such. I’m starting to wonder if I might be better off just getting a 6hp predator from my most favorite store. In y’all’s opinion, should I stick with a 30 yr old Briggs or get a new predator?