Deuter gets my vote too, for all the reasons cited by
@OzAnnie. They are heavier than other popular brands (e.g. osprey) but they are very sturdy and have great lumbar support.
I've recently 'upgraded' from a 30l Futura SL to a 35+10l ACT lite SL (ladies packs). Both are equally sturdy and have the same basic design, including the zipped compartments at the top and bottom which I like. The ACT lite has an adjustable frame, which the smaller Futura doesn't. When I was doing my research, I found that there were small differences between each model - e.g. the pockets and compartments. We all have our personal preferences about how we pack and carry our gear, so if both of your potential choices are equally comfortable, I suggest that you also take the smaller features into account. For example, my new Deuter has one of those stretchy pouches at the front, which I always coveted when walking behind Osprey carriers! I wouldn't have chosen it for that alone, but it was one of my smaller criteria when 'shortlisting'.
Good luck with your selection. Can you buy both, wear them at home, and then return one of them? That's what I did and it definitely helped. It was good to put my own stuff in each bag to see how they felt.