I have both. My 270 and 150 gallon tanks are both diamond edge/flat polish, eurobraced LeeMars. My 100 gallon tank is a custom sized/drilled Visio. The Visio was a bit cheaper (porportionally compared to the LeeMars), but isn't quite the quality of my LeeMars. The silicone job is nicer/neater and the overflows a bit more beefy/sturdy (as Loc01 mentioned, one piece on the LeeMars).
I have had my 270 LeeMar for a few years now and don't have any complaints. I would go with a LeeMar if you can afford it. If you are on a tight budget, the Visio is fine. Overall though, if I were planning a larger tank, i.e >100-150 gallons, or if I was planning on keeping the tank for many years I would pay the extra $ for a LeeMar.
HTH