I have not tried a Magma grill. My boat came with an old Kettle grill but I didn't have the mount to try it. I've had a Weber Q for about 4 years and have always been happy with the results. I prefer slow/low cooking and had a difficult time with the Solaire. I also prefer to keep my grill...
Purchase last season and used twice.. Decided to stick with my Weber Q. Includes rail mount which was an additional $150 or so option. Make an offer if interested.