Do you have specific effectiveness measures that are most important to you? This could be how quickly a treatment provides substantial relief, how thoroughly it ultimately clears the skin and/or reduces or eliminates joint pain, or how many years the improvement has been shown it can be maintained (since psoriasis and psoriatic arthritis are lifelong diseases). Those with psoriatic arthritis might also insist on one of the treatments that have been clinically shown to stop progression of irreversible joint damage.