New Tank Dimensions?

[Wretch]

Ok so I am really growing tired of my 54g corner tank. It is nice enough looking but it is a true pain in the butt to get flow everywhere. The aquascape is ok but the space is limiting hard to make use of your lights. So I am looking at a new tank that will have to fit the current location and use the current stand(its made to fit a corner so it has one angled side). I can do either of the following:

29x28x22/24 this one uses up most of the stand front to back with just 10" down the side unused.

or

39x18x22/24 this one use up all the stand on the front but leave 10" at the back so not sure about balance issues

Which would be best for flow and lighting and aquascaping. Cant wait to hear your opinions. Thanks.