I compare the 2018 models now, as the Monarch got changed quite a bit.
The Stomp has the most rocker of all Naish TTs. So with your weight and Lowend - forget it.
The Monarch is much more allround.For heavy unhooked landings it might be slightly harder though the crazy channeling in the bottom helps here, too.
I found the Stomp quite heavy, too. For highwind blasting in choppy water the Stomp was a dream ... but only there. It is quite slow, so you maintain in control.
The Monarch is a lot quicker so in highwind you will also reach some scary pace.
I would take the Monarch 138 though. The 142 is only 4cm longer. The width is the same. Don´t let yourself get fooled by the marketing bloat.
Naish uses the same wood core for all their TT boards and they are only 42cm in width. If you don´t belive me - go to your local Naish store and measure it. Same with the Stomp and all the other boards.
You will also sell the 138x42 version a lot easier than the 142cm one. I weigh 105kg and the 138 is enough for me.