I’ve used both, and can only really comment on PsA, as my P only exists in tiny areas occasionally.
I have found both to be very effective. I’ve had a sinus infection on Humira (2.5 months on Humira), whilst for 8 months on Enbrel had no colds or flus. Having said that though, all 3 other adults in my household (and my toddler) had an equally hard time with that particular cold. I didn’t need antibiotics, nor did I cease Humira.
Unlike Lamb, who uses real syringes, I’m a bit of a wimp and use an auto injector. I understand that Humira uses a preservative that if you have an allergy to it, makes it hurt a lot more. If no allergy (as in my case), the Humira auto injector (the mechanism) seems to be a lot better than the Enbrel one, as commented by my Rheumy and confirmed by me (in Australia - Louise is in the UK and perhaps it’s different?). I took a double shot of humira for my first go, and had to check the autoinjectors to make sure they’d worked properly, because of the lack of pain!
I loved my Enbrel, but got a second autoimmune disease it didn’t treat, so whilst it was great for my PsA, I had to switch.
The measured response rate for the two is not statistically different for PsA as I understand it, though I’ve not done the research for P.
At the end of the day - some will respond to Enbrel, some to Humira, and some to both. My particular decision was driven by the need to travel to developing Africa soon after commencement - so initially the shorter half life of Enbrel was important as I wanted the choice to cease it quickly before I went somewhere with an extremely high infection risk.
Now though, I have established that I have far less susceptibility to infection whilst on biologics than off them (yep - you heard right - I got stacks of infections I couldn’t fight before biologics, and have not been on an antibiotic since). So having Humira once every two weeks just means less medication to carry to Africa!
It’s very personal, because everyone has different requirements and responds differently, but the hardest part is to take the deep breath and start 