For me the mala doesn't matter. It is just a tool to count. The stories go that we usually count our mantra's in 100's, so the 108 beads is to account for up to 8 mistakes that we could potentially make. Yes I agree that using a bone mala, will help generate merits for the deceased, but for me we should not be so attached to the type of mala we use.
I for one, used to try and find the best mala. But then found that it doesn't really matter. Looking for a nice mala is just another attachment, and another attachment that leads us further from enlightenment. High monks in the monastery practice with whatever mala that is available To them it is just a counting tool.
So the idea, of having nice malas or different malas for me, is ok, but I find it rather samsaric.
Then again I can counter myself by saying that the mala can be seen as an offering to the Buddhas, so having the nicest one would be better to offer up.
These are just my thoughts. What do you think?