Kodak VRC550 vs/or VRC450 ? Or which dictaphone under €/$100 you can charge with USB/adapter/without the need of AAA/AA batteries would you recommend?

Hello people. I have the wish to "replace" my Sony ICD-PX312 I have had for years, due to the fact it's mono, but most importantly, it uses AAA batteries, which is extremely inconvenient. So, while it does its job for recording interviews or lectures, which I very seldom do, since my university's years are over since a few years now, for daily sounds recording and exploration, having to rely on batteries you have to buy and dispose of is not ideal, especially when you don't use it often.

So, I would like to get a new dictaphone, not of the professional level, but of the compact/pocket level, which doesn't rely on disposable batteries, but has an internal that you can charge with USB charger (which is why even if they seem interesting, the Zoom H1 or H2N wouldn't do, as they still rely on AA or AAA batteries).

The Kodak VRC550 as well as VRC450 seem to fit my bill, but: with only €10 difference in price, I don't know which is better to get. I don't know if there is a difference in recording quality due to the different type of microphone (seek picture to see what I mean); or if the only reason why the VRC 550 is more expensive is because of the colour screen and ability to be a mp3 player too (which I don't care about). So, if you had to chose between these two, what would you recommend?

Or, what portable recorder or dictaphone of $/€100 max (but not of the cheap/low-quality kind), that you can USB charge, would you recommend if there are better options than these two?

Thank you!