L2321 versus L2230 LCD Monitor - video input and preset modes differences

I am trying to decide between the ThinkVision L2321 and L2230 LCD monitors, and although the obvious difference is the size (ie. 23 in versus 21.5 in), the only thing I have a question about is the difference between their Preset Modes Text and the Video Inputs description which I found on the Lenovo Website when I do a comparison of the two.
L2321 - 23 in.
Preset Modes Text - VGS Factory mode Addressability Incoming video (H x V Pixels) refresh rate -----
NTSC 60 Hz NI PAL 50 Hz NI 640 x 350 70 Hz NI 640 x 480
Video Inputs: Analog / Digital
L2230 - 21.5 in
Preset Modes Text - VGS Factory mode Addressability Incoming video (H x V Pixels) refresh rate -----
640 x 480 60 Hz NI 800 x 600 60,75 Hz NI 1024 x 768 60,75 Hz NI 1280 x 800
Video Inputs: VGA / USB
If someone can help clarify this so that I can understand which is the better monitor and the reason for it, I would be very appreciative, or perhaps they are much the same and it is the difference in the size which makes them appear to have a difference.
Thanks!

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L2321 versus L2230 LCD Monitor - video input and preset modes differences