A:
The HW-H750 is a few inches longer than some of the other bars with similar dimensions.
Either would be recommended for the television, but a bigger subwoofer (on the H750) would be recommended for larger rooms, or deeper bass, or both.
There are other Home Theater systems that allow you to place speakers as wide apart as you'd like, and those can be found on the Samsung 5.1 Surround Sound systems.
Thanks for your interest in Samsung products.
--Mr. Samsung