Of course, the bigger tank is always better and consider that 275G loaded with ton of fishes while the OP "plan" only 3~4 fishes in 300G at minimum. Also, look at the GG in the video look like that thing well over 10 years old or the owner bought it huge size already!
Like this one. This is a video where they moved an obviously cramped giant gourami from its 275 gallon tank that is replaced with a 900 gallon tank.