There are a lot of different ink bottles styles. Some are cheap plastic ones, while others are very fancy and less fancy glass ones.
Some of them have different designs that make it easier to use more of the ink etc.
After using a lot of different inks over the years I only care about one thing. Not how they look because let’s be honest, all my inks is in a box unless when I refill a pen. And I don’t care about all the fancy crap that makes it easier to use all the ink because I can just syringe it out if I want to.
The thing I care about is being able to stick a pen in the ink bottle and not feeling like the weight of the pen will flip the bottle over.