I'm not sure exactly which racket suits my style better.
From what I remember using the Z-slash when the racket was just strung it was good on smashes, better than the Z-force but a little slow to recover.
The Z-force was a good balance.
Now I just want to try a new racket, just to see if it's better for my playing style.
I'm experementing here, I have never tried anything other than Yonex rackets.
If you are experimenting, maybe you can try rackets from other players of your club. If you buy something that doesn't suit you, it would be waste of your money. That's why you should ask yourself what you want from your racket.
Maybe it's the flex of the Z-Slash. The Z-Force is stiffer. You may try the Voltric 80, Arcsaber 10/11 or Armortec 900 Power. These rackets should be near the Z-Force and the Z-Slash. IMO I would not go for a headlight racket.
Well, following your trend, you might want to try the new Nanoray Z-Speed.
yea just get the z speed and be over with but seriously, you might want to try other brands, because they are very different. and i wouldn't just rule out light rackets since the only rackets you have are either even balance to head heavy, having a light racket or a head light balance racket might be good.
The best racket that fits in between of your Z Slash and Z Force would be either a
Gosen Ryoga Shiden (ultra stiff and small oval frame) (racket is hard feeling and paint quality is excellent)
Yonex NanoRay Z-Speed (stiff and has a slightly smaller than convention Z isometric frame) (racket is soft/dampened feeling and paint quality is subpar, slightly better than the Z-Force)
I say try both before making a decision. The Shiden is more stiffer and faster than the Z-Speed, but the oval frame is smaller and narrow, making the sweet spot quite small, so you need time to adjust. I had quite bit of timing issues with the Shiden when I initially purchased it and used it. I had many mishits as well as swings and I hit nothing. The timing issue was contributed by the frame shape, as well as the fast swing speed of the racket.
The Z-Speed had no timing issues at all. I bought it a few weeks ago and got it strung, I play just as well with the Z-Speed as with any other racket I am familiar and comfortable with. The Z-Speed is more user friendly out of these two rackets.
Another great option is the Gosen Ryoga Ougi, but it is sold out in many stores as there were only 1000 pcs made. The Ougi is a little bit less stiff than the Shiden and the frame is easier to get use to. It is just as fast in handling and swing as the Shiden. when I bought my Ougi back in July, my initial use with the racket was not as bad as with the Shiden. Took me around 30 minutes to an hour worth of rally and practice to get used to the Ougi.