Where I am,I find beaver easy and fairly quick to put up and I enjoy putting up beaver. The season is long, over 7 months means you can harvest a lot with a flexible timeline from fall,winter and spring.
With the volume that can easily be accessed,and Include the hide,castor and meat beaver is the most valuable for me right now,even on the raw fur market.There is also a great demand for castor at high price.Sold 130 castors recently for $1100 so that is around $8 per castor avg for every beaver harvested.
The tanned hides also sell well here to fur sewers,They are the top fur in demand for goods,and move at good volume.There is no market for tanned marten at profitable levels.
That said marten on the raw fur market has always been the "bread and butter" for northern trappers here,but not at a $25 avg today.
Just got a big box of fur back from the dressers yesterday.I add value to pelts by repairing any small defects and pre-blocking the tanned skins before selling to the fur sewers.