I plan on finishing up my registry this week and am down to these two choices for bottles. I will only be formula feeding due to medical reasons. I am looking for feedback looking at the bottles money wise. For those who use the Playtex Drop ins did you find the liners to be a huge added expense? I am looking for convenience and budget friendliness. DC will be going to daycare and I don't want to have to worry about a lot of parts to clean. Thanks!