WL alternative to Maple Physics package

I have some experience with Maple and especially with Physics package, which is really powerful tool to do very complex symbolic math operations in general Physics. Now I decide if it is appropriate to start using Mma instead of Maple. Is there any comparable alternative to the Maple Physics package?

Well, I know that a lot of Physics package functionality is covered by standard WL functionality, but I would like to know if WL cover all features of Maple physics package.

Thanks in advance for any comments …