What I can say is that I love my slowhand middle. Also bridgeplates are, judging from clips, pretty amazing and I would be very tempted to get a full baseplate set too when I get a strat.
I would deffo at one point try the Slowhand bridge too. After all trying is the only way to know which you like better. Only you can decide which you wanne try first. It is also dependant on how much work it is and such. To get the results quickest you might wanne try the SH bridge now since you already have the MQ in you ear. That way you can quickly find out which bridge you like better.
Then it is a question of how well they work with the rest for you taste.
In my mind the SH with bridgeplate should be a very very nice PU. To imagine a SH with more bottom end and hotness makes it come closer to a P90, maybe stricking quite a great balance between start SC and P90.
What my non baseplate SH middle does is amazing enough.
Main thing is that both will probably be pretty great, now you just gotta find out which you like better in that axe.
