scan experiment

I would have to say the left stamp.

all of them would work..but i too like the left one

It depends on what you are looking for. It appears the left scan is the raw scan, while the 2 scans to the right have been smoothed and the brightness/contrast tweaked.

The 2 on the right are better if you are looking for a "prettier" picture (kinda like the fuzzy lens on actress close-ups), but the one on the left preserves the details if you are looking for plate flaws or specific design differences.  In fact, it appears that artifacts have been introduced as part of the applied effects (in middle pic you can see a horizontal white "spray" in oval starting from the back of Washington's head;  in the right pic, you can see a "wrinkle" in the left margin at the level of Washington's eyebrows).  Then again, maybe there really is a crease/wrinkle there and the effects highlighted it;  hard to say whenever you apply effects -- you always have to go back and examine the actual stamp.

I assume the pixel effect is because you scanned at <300dpi. I recommend you scan at a slightly higher resolution to remove the pixel effect, rather than relying on smoothing (I'm just guessing that is what you did with your pics). It is better to scan at higher resolution, and then reduce as needed. I do things a little overkill and scan at 600dpi. There is a tendency to scan at multiples of 300dpi, but that is primarily because the default settings on scanners are designed for the printer resolutions. For on-screen viewing, scanning at 400dpi is typically of optimal efficiency (benefit increases less with increasing resolution costs after that for typical computer screens). If you want to get the fine details when looking for secret marks, plate flaws... then higher resolutions such as 600dpi are worth the extra storage/upload demands.

Just my opinion.