There are plenty of studies/test that show most of them are all the same.
One thing that has been a huge upgrade in this department for me was getting the little refill valve adaptor. Get a big can, refill your little cans a few times. There are a few different ones on Amazon for like 10 bucks. Stick the little one in the freezer for a bit then couple the big can to the little can and open the valve. Use a scale to make sure your not over filling.