I don’t know whether to say commiserations, congratulations (getting out of limboland), welcome (officially) to the ‘family’ or just awwww!
I honestly can’t really offer any experience. When I was diagnosed there just weren’t the vast array of choices you have today.
I like to think had I been offered the 3 you’ve been given the choice of, I’d have taken the ‘risky’, scary option of Ocrevus. I know when I first heard of Lemtrada (or Campath as it was called then) in about 2002/3 ish, I’d have given anything to try that. Not that it was anywhere near licensed.
I would personally rule out Copaxone as there can still be side effects and the benefits are only a relapse reduction rate of about 30%. But that’s just my view.
Honestly though, all I can say is to talk about it with your family and friends. Try to get them interested in the risks (side effects) as well as the benefits (relapse reduction rate). Get them to have a look at MS Decisions aid | MS Trust (I assume you’ve seen the decision aid?)
Talking through the options may just help you to make your own mind up. Like if your best friend says ‘take the big guns’ and your parents think that’s too risky ‘take Copaxone’ (or vice versa). You may make the decision to go for Tecfidera!!
Other people will probably comment on their own decisions, having had the same kind of choice you’ve got to make.