A true linear pump will be the best, but you really can't find smaller sized ones that I have found. My issue with buying a pump that big is the noise from bleeding off all the extra air I am not using. Having that constant back pressure in the air lines from what i heard read/heard eventually kills our pumps so i have always been forced to look for smaller options.
I have 15 aquariums and running this little pump is really quiet and does the job very well. They do make different sizes but i have only personally used the AL-15A
ALITA Linear Air Pump - 10 ~ 30 LPM