What’s better: regional TC or magic circle paralegal?

I’ve been offered a training contract at a large regional firm and a paralegal role at a magic circle firm.

I have no idea what to do. Obviously a training contract is more attractive but even if I start at a regional I wouldn’t want to stay there for long and I don’t know how easy it would be to move on. Would paralegalling at a magic circle firm open up opportunities for something more?