Felder doesn't make the saw blades (most machinery brands don’t, eg Festools saws — and probably the Felder branded ones — are most likely made by Leitz) — you pay more what they buy in and have branded.
Research experiences from other users and try out what is recommended. (What is good and available also depends on your location. In the US Forrest gets mentioned a lot, in Europe Leitz, CMT, AKE and Freud.)