In the old Bosch flew at me every other time the fuse, because probably no starting current limitation was present. This was also a reason to buy me even a grinder.
The Metabo was about 1-1,5kg heavier than the Makita, what you really get a sense when you take it in hand. However, the old Bosch was so difficult. The heavy weight was the reason the Metabo to send back, I have not even cut.
The Makita has tested by the greatest depth of cut - namely 8cm, which I needed for my patch. I have other devices to measure, and the cutting depth was approximately 7-7.5 cm. This means that you have to cut a 8cm thick stone always twice, or breaks it at the end and the edge smooth grinds.
Tiny downside of Makita - there are only two Groffpositionen, bottom and top - the side is missing. At first I thought it bothers, but does not. All other models have actually the three grip positions. I believe it is up to the dainty gearhead, but allows the high depth of cut.
The Makita running on very gently, so that the backup does not come. The old Bosch unhooked sometimes what can be unpleasant if the wheel in stone threatens to become jammed. This is then always an ordinary jerk and attracts an almost the angle of the hand.
So ... in my view has the Makita clearly won, mainly because of the unbeatable low weight and highest cutting depth. I have used for about 20 cuts the con: p-diamond cutting disc and still have the first disc in use.