Delta or Virgin?

Hi, I'm after some advice. A little while ago I managed to get 3 G's to MCO via ATL end of October , very excited to be travelling UC , however my daughters friend now wants to come away with us. He wants to be on same flights , and will pay for PE. At the moment Virgin are quoting higher rate than booking direct with Delta.? Does it make any difference if he books with Delta? Can we guest him into clubhouse? Can he check in with us?
Thank you .

From having a look around - if he books with Delta using the Premium Economy/Comfort+ option he will be given PE seats on the Virgin legs, and Comfort+ on the Delta legs (basically extra legroom). If he booked with Virgin he'd get PE for Virgin, but sat in regular economy for the Delta legs. So booking with DL is better in that regard. (Even though it's a short flight it might be nice to have the extra space!)
As far as I know he can still be guested into the clubhouse and check in with you, so you should be fine on that front too.
If the price is cheaper, then Delta win on that front too.

The only other thing to bear in mind is that if the booking is made through Delta, then he will need to go through them for any changes, queries, etc. But otherwise I'd say go with Delta in this instance.