Hi Mandy
Welcome to the forum. Sorry to hear that the Humira/Mtx combination hasn't worked, but it is great that your rheumatology team have offered alternatives. There are so many drugs available now there is sure to be something that will work for you!
I'm afraid I can't offer any thoughts on these two drugs; I'm currently on Enbrel, Naproxen and Prednisolone (MTX bit the dust a few months ago!). I'm sure someone here is on Rituximab, can't think who though!
Here is a link to the NRAS page about the drug and
here is the link for Tocilizumab. There's lots of information about the different drugs and a booklet specifically about the Biologics.
Sorry I can't give you any personal experiences on these. Good luck and keep posting!
Lyn x