What I've found in the UK is that they are now prescribing Humira over Remicade/infliximab as its more cost effective, not only is it cheaper but it doesn't require you to spend x amount of time in hospital receiving the infusion so its seen as more convenient for both the patient and prescribing hospital.
In fact last time I went to my doctor they said they can't prescribe remicade anymore without begging the budget department and proving its the best way to go for the patient, so new patients to these drugs will automatically go on Humira first. They've even changed a lot of patients from remicade to Humira (I had several specialists at the hospital trying to convince me to do this, I refused point blank, if it ain't broke don't fix it, I'm 'saving' Humira for if and when remicade stops working for me) He said that hopefully the next time I have a flare it shouldn't be too much of a problem getting me my remicade as I have a long history with the drug and so far a lot of proof it works for me.
But from what I understand they have had great success in treating patients on Humira too, I'd just rather stick with what is familiar to me and what I know works for me. These are big drugs and ultimately it should be your decision over which you put in your body, just my opinion, but if you'd be more comfortable trying remicade theres no harm in asking and seeing what explanation they give.