It's really a personal choice. For a first pair you may be better off with something softer, because stiffer stiffer wraps are a) way more uncomfortable if not downright painful; and b) stiffer wraps are considerably harder to wrap.
For what it's worth I wrap my own knees and only use wraps close to a meet and prefer stiff wraps now, but when I started using wraps I preferred them softer.
I like the red Slingshot wraps, but they're relatively stiff. I haven't used the blue ones, but I have a blue Reactive Slingshot and I understand the material is the same and I think that they may well be a very good first wrap. I would avoid Inzer Iron Zs, which I had at first, but that's just me.