Given a choice between J to TLV on CO, DL or US I would pick CO.

On price, all three products are pricing out about the same for travel this summer, as low as about $2,400, which is a great deal.

While DL and US both have a little but more legroom, the 55" on CO is completely comfortable.

CO and DL both have better catering and IFE than US, but only CO flies the 777 with a much wider J seat that is 22" wide. The DL J seat is a brutally narrow 18.5" (only slightly wider than most Y seats), while US's Envoy seat is 19.5" wide.

Also, the seat CO uses in its 777 J cabin is a far better, more comfortable seat than the ones on DL and US (although that's obviously a matter of preference).

Finally, you can fly US Envoy sleeper class, but you need to consider the drive to and back from PHL if you live in the vicinity of NYC.