What yoyo would you recommend me using?

So I have the shutter 2013/2014 not sure but the old one, the magic yoyo y03 hertz and the V12 toiponner. Tbh I've put myself in a situation that I don't know which yoyo to practice with. Im sure they all have their pros and cons but what would you recommend. I do wanna learn those tricky combos and try become a good player. I know it sounds stupid but honestly they all function differently. So it's hard to stick with one. In one hand the V12 is wide so string tricks are easier but on the other the shutter is a signature yoyo made for winning. The hertz is like the shutter but lighter and quicker.