If you want to be a professional member of any ski patrol in the US get your OEC. some resorts will acccept a WFR, but you may have to do additional testing.
Ive had my WFR for three years and an OEC for two. OEC for patrol all the way, check out NSP.org.
If you want to be a mtn guide you will need more then a WFR. Check AMGA( American Mountain Guide Association). H20 heli guides also offer some courses. Ski guides need medical training,mechanical training(for heli and cat ski guides), and of course avalanche stuff.
A WFR will beef up for resume if anything, and its good to have in case your encounter any type of medical emergency. You can get a job has a river guide with a WFR, but very unikley with just a WFR, I'm an apprentice ski guide and I have multuiple certifications for medical and avy training.