The name for this variation of the lowercase a is know as a single-storey (without hook) or double-storey (with hook).
There are definitely more typefaces that use the double-storey and as JonW points out the most common typefaces on the web use the double-storey, so people will most likely be familiar with them.
Some typefaces use the double-storey for the Roman (upright) font, but use the single-storey for the italic font.
Interestingly the typeface Dyslexie, which is designed for people with dyslexia to make it easier to read, uses the double-storey variation. Which could indicate (in theory) people who struggle the most with character recognition don't have an issue with either variation.