My comments:
(1) ChuChu - no dripping. But a lot of gas when bb sucks continuously. I used it as water bottle only.
(2) Bfree - very good with no gas. The downside is it has many components to assemble/disassemble/wash.
(3) TT - I used it as supplement milk bottle (because I have 4 Bfree bottles). No gas. It is simple to assemble/diassemble/wash. I used the Close to Nature bpa free (fat bottle).
Plan to use TT for this baby. Bfree really has many components to wash.