There can be large regional variations in otherwise 'identical' couriers.
DHL would be my preferred deliverer on the Big Island, by far - Andrej will arrive in the first five minutes of the hour that was predicted, infallibly.
Others are less reliable - I had a delivery, by Yodel, 'to a neighbour' whilst I was exiled on the Western Island - they informed me by email and I forwarded that to the alleged sender, my phone supplier, as I suspected it was a scam - that neighbour actually found it eight weeks later, hidden behind one of my bins. The sender, having initially denied sending me anything, and knowing that I was in exile, then spent two days ringing me on my UK landline and complaining that I wasn't answering (er....), then, finally emailing me and demanding that I tell them what the label said, when I didn't even know who had it - and nobody actually did.