It always seems the lunchtime flight DUB-DXB is packed out, and the evening flight has quite a light load, so perhaps greater capacity on the lunchtime flight could be needed. Or maybe that's just how it has fallen on all my flights.
Lounge in Dublin is basic but it's alright, just nothing in comparison to the DXB or Emirates lounges elsewhere. The evening flight is pretty much the last flight of the night, so expect a very quiet airport and lounge. Daytime, the lounge fills up, and you may be a bit close to others, but I've not seen it completely full before.
Food etc ex-DUB same as rest of the Emirates network.
And finally.... It's always nice to hear them welcome you on board or back home with a little bit of Irish - even though I don't speak it I can recognise it. Nice touch!
Just shout if you've any other questions.