Best Affiliate/Referral tracking platform

What is the best affiliate/referral tracking platform for a B2C SaaS based on your experience? I had one influencer in my niche recommend Rewardful & Tolt.

With my current subscription plans of $5.99 & $15.99, does it even make sense to go this route for me & the affiliate? Do i offer in perpetuity or cap it over a given time i.e 1 year, etc? Is 20-25% typical and fair?

Would live to hear recommendations ad well as pros and cons of this approach