Although I don't own one, by all accounts the Comet is a fine pack for its intended use. I do use a Jam (original) Pack which fills a similar need.
I wouldn't be looking for a similar pack to replace the Comet, unless there is a specific problem that you have identified. If I were you, I would access my needs for a completely different type of trip and not even compare it to the Comet (apples & oranges).
For instance, I have a Granite Gear Nimbus Ozone (3 lbs.) for winter trips in New England for me and the wife. Like you have experienced, I carry about 75% of our joint load leaving her the remainder. This makes sense because I am over 6' just under 200 lbs. and she wears a petite size 4.
I consider the 3 lb. pack a good investment in additional weight because I couldn't last anytime with a frameless, lightweight pack in those conditions. With that "heavy-duty" suspension, I can't even feel the load! I know that I'm carrying more TOTAL weight but, it FEELS like less weight and to me, what it FEELS like is what's important.
I also have a "uber-light" pack, mostly for cold weather day-hikes and fanny packs for summer day-hikes. So IMHO,it's not which pack is best. It's which pack is best suited for the conditions.