As sbm12 noted, the 900 is most likely to have DirecTV and will certainly be the newest metal. I would avoid the redeye (753) as service is limited and sleep will be uncomfortable if at all. CO F breakfasts are the best and most filling of all NA carriers but you'll have an early wake-up call. If you like to get up at a civilized hour and/or like to drink and fly (or fly and drink) the lunch or mid-PM dinner (mostly 753s in January) would be better.

As the LAS-EWR schedule changes frequently over the next month and a half, if you tell us you approximate travel date, we can opine more specifically.