If in business class EI
offers the best product from USA gateways direct to Dublin but very poor IFE, if that is important to you.
If in economy, then the difference is marginal, the EI
economy product is in rapid decline and may now be worse than the US majors. Possibly the best of the US carriers in economy on the Atlantic is CO
, but their connection out of EWR
may not be ideal for you. DL
might be easiest.
I would strongly recommend not connecting to DUB
unless there is a huge price advantage on offer. It is a great deal of hassle even in good times.