My answer is that it depends. However, gas sometimes tend to be a problem with those types of bottles. Playtex and a few other brands make bottles which use disposable plastic liners that collapse as the baby drinks the milk. These are convenient in that they prevent upset tummies because of less gas, and they are presterilized, so there is no need to worry about sterilizing bottles. There are also a few different sizes of nipples available.
Some brands also offer a toddler size.
I would suggest that you go buy a few single bottles. Inspect them for convenience and features, pick one and try it with your baby. If you are both happy then you have chosen your bottle. Most all babies are born with dark blue eyes. Usually if the color is going to change it will start to do so in the first few months after birth.