Neither of those are high end manufacturers but solid units non the less. They are both designed for the more value conscious purchaser.
Yes you will give up a bit in warranty, fit and finish, energy efficiency, longevity, noise level and bells and whistles. But they will be good performers for the money.
You will have to spend 3-4 more grand to get more tub. Just like anything, in most cases you get more when you spend more.