I’m sorry you have joined us, but welcome!
Like most people, I have only used one injectable - Avonex - I was on it for some years and never had much bother with it. Side effects were generally mild and easy to control with ibuprofen and the injection, while it was not my favourite activity, was OK too. And it’s only once a week.
You have a lot on your plate at the moment. Do take your time about choosing a DMD - I hope you don’t feel that you are being rushed. In my day (!) you would be offered whatever DMD your consultant favoured, take it or leave it, and at least that made life easy - there is a price to be paid for all the choices people are faced with these days (God, I sound even older than I am.) On the other hand, it is nice to be able to think about which delivery system might suit your life best. And besides, as others have rightly said, if your first choice does not suit, you can always try another. So please don’t get stressed about this decision.
There are no rights and wrongs - but whatever you decide, I hope that, like me, you feel glad to be taking one of the best available drugs to help deal with your MS.