Several things:
Hooped is good IMHO. Ever woke up in a bivvy with 2 feet of snow on your face? It's freaky and the hoop is not really that big of a deal weight wise. Secondly hooped is good if you have broad shoulders. You can move around a bit without killing yourself, place items near your head such as a headlamp, etc.
Tents are great, but hey, then you have to put your sleeping bag in a stuff sack. More weight, more work. Just stuff your bag in your bivvy, zip it and go. When you stop pull it out, crawl in.
I have a Bibler hooped and it is the standard for all adventures. Doesn't have any straps to hold your sleeping pad. It is very waterproof and durable. 8 out of 10 stars. Was fairly well priced. Around $200 if I remember right. There is also a big wall version for tying in.
I also have an OR basic (or whatever it's called-works fine, but lays on my face) Has hoops to secure your sleeping pad. Never had it in bad weather so can't comment on it's durablity and weather worthiness.
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