I tend to use 330ml brown glass bottles for stronger beers and 500ml bottles for lower strength beers, below 4.5%, generally speaking.
In my early days I used plastic pop bottles, which work well, and allow you to release some gas if the beer is too gassy. They do allow oxygen to seep through into the beer though, so you need to drink the beer within a few weeks. Brown glass bottles look after the beer well for a long time, and they are cool, too! It feels like you are respecting your carefully crafted beer by bottling in nice glass bottles. I've drunk 2 year old bottles that have been awesome after all that time conditioning inside the glass.
In my early days I used plastic pop bottles, which work well, and allow you to release some gas if the beer is too gassy. They do allow oxygen to seep through into the beer though, so you need to drink the beer within a few weeks. Brown glass bottles look after the beer well for a long time, and they are cool, too! It feels like you are respecting your carefully crafted beer by bottling in nice glass bottles. I've drunk 2 year old bottles that have been awesome after all that time conditioning inside the glass.