I’m wondering which one to get (I use b/s/t). The specs are both fine with me, but which one do you think is better play-wise and why?
Well, I have never used a Magnum, but I own a 5 star. The 5 star plays light and fast, and it can take a serious beating. I persinally love mine. 
the magnum was a magnesium yoyo by general yo.
never played either though…
You can’t go wrong with any General-Yo yo yo!