It really comes down to surface area. The more area that is open the atmosphere, the more you will boil off. Wide, low pots are nice for making sure you boil off DMS but they do require you start with greater volume in the pot to reach your target volume.
Tall, narrow pots will not boil off as much volume (and probably don't affect DMS that much either) so you can start with less in the pot.
I, personally, weigh economics and access. My 12 gallon boil kettle is nice and wide and easy to work in but it takes a bit more gas to heat it up. Everyone makes their own choices.