Our experience with NSAIDs has been:
Meloxicam: Diarrhea and/or vomiting within 3 days on two separate occasions (may be due to difficulty of exact dosing, which presumably would be less of an issue with Metacam since it's a liquid)
Rimadyl: No side effects but was not as effective at alleviating limping
Previcox: Effective w/ no side effects
We always gave Pepcid 30-60 minutes before, then a meal, then the med.
We did not see any major improvement in Sweep's limping with Duralactin, Springtime products, or the Chinese herbs prescribed by her acupuncture vet. That is not to say I think they are bad products; they just did not work for her issue. She will always be on some sort of joint supplement as a preventive, but if and when her toe issue flares up again I won't hesitate to go back to the Previcox. My vet sees a lot of greyhounds and was somewhat surprised by her reaction to the Meloxicam but said it's like with humans: some people can take ibuprofen but not aspirin, or aspirin but not naproxen. So for whatever reason she just can't tolerate that med. Ryder might be totally fine with it. I do believe Previcox is thought to be a bit more renal-friendly/gentler on the system than some of the other alternatives.