Here are my thoughts, but I'd like to hear what you guys think.
Black:
Pros: Has a cleaner more finished look. Hides algae.
Cons: Distracts the viewer by drawing eye to the seam. Makes the tank look framed. Will show a rough edge after long term magnet cleaning.
Clear:
Pros: Doesn't stand out.
Cons: Will show algae. Not as clean/finished looking.
Black:
Pros: Has a cleaner more finished look. Hides algae.
Cons: Distracts the viewer by drawing eye to the seam. Makes the tank look framed. Will show a rough edge after long term magnet cleaning.
Clear:
Pros: Doesn't stand out.
Cons: Will show algae. Not as clean/finished looking.