As a biotechnologist who just attended the end of year dinner of the botany department I have something to say:

On one side of the room you had the ecologists, on the other you had molecular biologists; the former group, looked like the sort of dirty hippies who I'd never get closer than 50 meters from my sister, the second group looked all like nerds and overdressed for the occasion.

Now, seriously, take into account the career possibilities after graduating:

Are you into science for the research?
If so, you have 2 options:

Being an academic or working in the industry. Both have their pros and cons.

Ecology is pretty much limited to be an academic as the industry does not invest on it.

IMH Biology per se is too general and does not grant you a position in the industry.

What is it that interests you about biology?
zoology?
microbiology?
molecular biology?
Biotechnology?