Is there anything different about a top fill tank besides the obvious? I get that you fill it from the top but why do they make top and bottom fill is one better or function better then the other?
BTW - There is One Down Side to a Top Fill Tank.
And that is you can Fill the Tank with enough e-liquid so that if you Need to unscrew the Base from the Tank, you're going get e-liquid pouring out of the Center Tube.
This Isn't and Issue when your Set-Up is running good. But I tell people that on a New Build with the RBA Section, or when you put a Replace the Coil Head, only fill the Tank about 1/3 of the way.
That way if you have to Unscrew the Base to Adjust the Coil/Cotton, you don't make a Big Mess.
Once things are Running Smooth, you fill your tank to the Top.