I prefer SE (superelastic) tyres.
IMHO the only two advantages of pneumatic tyres are: easy replacement and a bit better cushioning.
To replace SE tyre you need a press, although some manufacturers offer already easy exchangeable SE stuff (like Continental - the Easy Line).
The SE advantages are significant.
Longer lifetime is true, specially, when you can easily and with very low expenses renew the tyre, cuting the new tread.
SE are more robust, nearly service free (you must remember to keep the proper pressure in pneumatic tyres).

We sell Continental and Trelleborg tyres - SE and pneumatic.
From our experience, good quality SE tyre lives about 20% longer than pneumatic. Obviously - we compare the one-brand product.

I think, that most important issue is the quality of the tyres.
In our service contracts we calculate the tyres replacement every 3000 hours (SE), 2500 hours (pneumatic) for the aplication you described.
Some products, present on the market, last only 1500 - 2000 hours. These are mainly "no-name" tyres manufactured somwhere in Asia.