I have both & my young Welsummer went broody for a couple of weeks & then forgot all about it, but both Marans are like Katy's - they 'd rather be broody than lay! One is 1 year old & the other younger-in fact from same hatch as the Wellie hen.
I like the Welsummers better overall, will keep my 2 Marans but just hatched out some more Welsummers.
We love the mixture of colors---have EEs, Ameracaunas, Blue Rocks, Blue Andalusians in addition to the Wellies & the 2 Marans girls.