An earlier game on a saturday would be preferrable personally, as it means less likelyhood of having drunken fans and running the mele of town to catch the bus/train home!
Sunday 6pm is my No.1 home game time
Saturday 6pm or 6.30pm when city are at home.
We had Friday night games in the WNIR and they seemed well attended, so maybe that should also be a consideration, esp for belfast games, where flight schedules may impact viability.
If we had an earlier sunday face off time away travel may suffer(both our fans to other places such as sheffield/manchester on a Sat. Also away fans would have to leave sheffield etc about 10am or so to get here - thats one way to put off families coming down to us!