I have an assortment of Stainless steel tankards!! for a number of reasons,
the "portability factor" is an important one, as we Gianting Folk are often in processions, not having to "drink up, we're moving" is easier to manage
I can ALWAYS taste the pewter if I drink Cider out of it
secondly all this tosh about "lead free" pewter not poisoning you or being tasteable!, No It has cadmium instead of Lead!!!! and cider would, and does, leach that out quite effectively.
but also Stainless steel is much less susceptable to dents and other damage from being dropped and is just more Robust. All I need now is a Stainless steel with a lid for the same reasons (Kamikazi wasps) given by Liz above.