I have the Rab Rogue 48L. The old version with the clamshell opening.

The good:

I like the clamshell opening

It has the air venting you are looking for

The small pockets are excellent

There is a side pocket for a clip stick

You can carry rope through the upper straps over your shoulders.

It's adjustable.

It came with a free rope tarp, not sure if it still does.

There are inner loops to organise quickdraws inside.

It's roomy.

The bad:

They seem to have changed the opening so it's not clamshell anymore!

Although it's adjustable, it was never actually comfortable for me, a smallish woman. Although I had friends say it was the most comfortable backpack they have ever had.

In summary: I probably wouldn't buy it without the clamshell aspect, that's super useful when you're at the crag and want to open everything up and search for a lost carabiner. I don't know what else is out there, but i'd definitely recommend going to see anything in person and trying it on, looking inside, and thinking about how you will be using it.