Try to avoid all of them, as they carry quite considerable health risks, and long term usage is not fully understood as yet. Don't be part of the long-term trial!
I've stopped them entirely, having tried voltaren, feldene, celebrex and mobic.
Always hard to say if there was any benefit as I still had to take pain meds at the same time.
Try to stick with non-addictive pain meds, such as paracetamol.
I'm having great success taking 2x 665mg caps every 8 hours, with an occasional tramadol if I overdo it.

But-----the biggest benefit I've had with my 30 years or so of chronic pain is simply from large daily doses of magnesium oil.
Been on it a year and still improving. Muscle pain virtually stopped, so now just have to treat a few joint pains.

Try to avoid the dosage increasing medication path like I was on. It seems that the actual mediction was causing a lot of the pain, oddly enough.
Once I was off it, the pain lessened dramatically.
Keep an open mind and keep researching!