Neither.
Bobbleheads gave magic effects which I did not like.
And snow globes didn't give anything but more money.
If I'm going to scour the wasteland for these items then I want something worth the time invested in it.
So both svcked.
I like collecting, but those bobbleheads really didn't make any freaking sense.
Snow Globes at least made sense, until they became magic in the DLCs.
I'd rather see us collecting something of use to the plot or the character; components of a weapon or device, scattered pages of a journal that, when complete, can be decoded and reveal useful information; something like that.