Leeks modules or bare root transplants

We've sown two batches of leeks. one in module trays and the other in frames. The module trays(sown 3rd week March) were germinated in our growing room and grown on in an unheated and well ventilated poly tunnel.

The frame leeks were sown 2 weeks later than the above and were direct sown in a frame, protected by bubble insulated plastic.Leeks grown in modules

Leeks sown in frames

The initial growth rates of the module sown leeks was faster but the frame leeks have almost caught up this week. However the module leeks can be planted as smaller plants and these were planted in the beds last week. I estimate that it will be another 7 to 10 days before we can plant the frame leeks, it remains to be seen how much difference this makes when the crop matures.