There is a lot of good information on the Tele Vue site.
See
https://www.televue.com/engine/TV3b_page.asp?id=154
Specifically
https://www.televue.com/engine/TV3b_...n=Advice&id=96
Eyepiece specifications at
https://www.televue.com/engine/TV3b_page.asp?id=214
The field stop (mm) column is an indicator of true field. You can see that the 40mm Plossl, 32mm Plossl and 24mm Panoptic all have a 27mm field stop diameter and therefore give the same true field.
True field of view (deg.) = field stop diameter (mm) x 57.3 / focal length of telescope (mm)
For the above three eyepieces you will get the same true field but at different magnifications and apparent fields and exit pupils. The 40mm has a 43 deg apparent field, 32mm is 50 deg and 24mm is 68 deg. I find the 68 deg a very pleasing wide field to look at and still be able to take in the entire view without having to move your eye side. The exit pupil determines image brightness and it is calculated as follows:
Exit pupil (mm) = eyepiece focal length / telescope focal ratio
Also Exit pupil (mm) = telescope aperture / magnification
Of the above the 40mm gives the largest exit pupil and the 24mm gives the smallest. However even at f10 the 2.4mm exit pupil of the 24mm Panoptic provides for ample light and better contrast as the background is darker than the 40mm which gives a 4mm exit pupil. In an f5 telescope don’t even contemplate the 40mm as your exit pupil will be too large but in any case the 40mm is like looking through a tunnel because of its narrow apparent field.
Of the three eyepieces I have recommended, if you had to choose one I say go the 13mm Type 6 Nagler but only after you’ve looked through a few eyepieces first at a star party through a telescope similar to what you are contemplating. You may actually like something completely different.