I considered them. Wikipedia say Cardinals get 1.25" and GNT get to 1". For the color difference I favor the Cardinals.
If you travel down to Sac, you can stop by and see what 300 look like in my tank, they are good sized, and not just yet full size. But it'll give you the best perspective of what they will look like in the same sized tank.
Shrimps and Otto cats, maybe a few smaller nice plecos etc.
A nice school in a large tank cannot be beat.
Rummies are nice also and school better and run faster, but the colors of cards are hard to beat.
These guys are only about 6 months old, so in another year or so, they will get full size.
Against a dark background, they really look good.
A white sand foreground will also help the color.
I also have a "pug wood" piece of driftwood that only a dog lover will truly appreciate.
One of the weirdest pieces I've ever found.