since Empire uses the partypoker plattform, it might be good to promote UltimateBet, just so not everything is dependent on how party does. Empire is just a skin for party, so if users don’t like party, they should not like empire. Therefore, when chosing UltimateBet, you will have two programs totally independent from each other.
I can’t say anything about conversions or player values though for either poker room!