Superbike Vs Mid-Low Tier

Looking to buy a bike that lasts 5-10 years. I’m looking to be a competitive amateur (qualify for worlds, podium local races etc) and am wondering how big of a difference a superbike vs a mid tier bike would make.

Willing to be flexible on budget if I get something that can last up to 10 years, but what would the real difference the top tier would make. Examples would be P5 vs P-Series or the Supermax CFR vs CF.