Go for hospital grade pump like Spectra S1 which is the most popular one & highly recommended by many mothers.
I got a cheap Real Bubee & an S1 but prefers the latter better although both yields me the same and strong suction but battery wise, S1 is better.
Not all mums are the same though. For S1, some does not yield as much as they do with other brands. Maybe try to get a 2nd hand S1 at Carousell to try. Just need to buy all new accessories.
Anonymous