I'm thinking the majority of people will probably go with the penstyle. There's not too many downsides compared to the 901.
Longer battery life, larger cartridge capacity, and several respected vendors sell them.
Penstyles aren't too popular for taking out and about due to their size, but, for home, I would think it would be a nice fit.
perfect...I might just get both but im tryin so hard not to!