I have the choice of using 3 scanners and I'm not sure which would
give me the best high quality colour photos.

From reading the specs on HP's website it seems to me that the choice
is between the 3500c & the 5300c as the HP 2200c has only 600dpi.

Now the 3500c has a greater bit depth (48bit) over the 5300c (36bit).
And both have optical resolution of 1200dpi. But the 5300c has "1200
x 2400 hardware resolution".

Which do you think would give the better results? The greater bit
depth or this 'higher hardware resolution'?

TIA.