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Rod,
Optically there is little between these two eyepieces. They are very close in sharpness, contrast and light throughput.
For a given focal length, the UO HD ortho will have slightly longer eye-relief making it easier and more comfortable to use. In addition the ortho has cool neutral colour reproduction, as opposed to the TV plossl which is quite warm and adds a "coffee" tint to the target, which some people (not me) prefer. At the shorter focal length ranges there is more availability of focal lengths with the UO HD orthos. 5,6,7,9,12 whereas the TV plossls are only available in 8mm and 11mm. I own a full set of UO HD orthos if you would like to try them before buying.
In short, they are both outstanding eyepieces and you would be very happy with either.
CS-John B
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