I have owned 120 Gal. acrylic and 120 Gal. glass tanks.
The acrylic aquired an irrepairable scratch. Right center midway up. Every time I looked at the tank that scratch jumped out at me, and everyone commented on it. It bedeveled me till I gave it away. Also I didn't like the reduced access at the top as compared to the glass, also the brace at the top was a grunge magnet that after numerous scrubbings, (the only way to get the grunge off), became opaque and blocked light. There was no tint in it but it did have a lot of light distortion. I was easily moved by 2 people.
The glass did have a green tint but with good lighting it is negligable. As to the "ugly" seams, while they are unsightly, from my perspective just blend into the background as a border. I 'recon they are a neccessary evil. I liked that it had almost total access through the top, minus approximately a 6" brace in the center. It took 4 healty men to lift it to its platform. I guess if you're not in a traveling aquarium show moving it won't be much of an issue.
I am currently in the process of designing and building a custom aqua system to populate with African Cichlids, and a clown pleco or two.
I'm considering acrylic for my wet/dry filter. Would appreciate any input on this as I only have experience with glass in that application.
Also I am toying withe the idea of a hybrid tank using a reinforced carbon fiber strata as the base, maybe sealing it with poly-urethane, or if possible use it as the base and back. Anyway that's just thinking out loud, I
have only just begun to research that.
So my conclusion is, unless my carbon fiber deal flops, glass is my preferred medium.