difference between 1772 and 1777?

Hello!  Currently trying to figure out which eval board to get and it's between the 1772 and 1777.  What's the difference between these two platforms?  From the datasheets I see that the 1777 allows a higher sampling rate.  Is that the only difference? Was the higher sampling rate added at any cost relative to performance of 1772?

Thanks for any help you can provide.

Sincerely,

HitchHiker