This is what I can offer:
I have a pair of Orion UltraView 10x50s. These are good quality ($175) Japanese binoculars. They were made in Japan, they operate at the full 50mm aperture, they have a 6.5 degree AFoV and plenty of eye relief for me. They weigh about 2 pounds.
I also have a pair of Orion Resolux 10.5x70's. These are $400 binos, Astro-Physics sold them, they're the same as the Obserwerk Ultras. They are Chinese, operate at the full 70mm aperture, they have a 5.0 degree field of view and plenty of eye relief for me. They weigh 5.5 pounds.
Exactly what suburban skies means, I am not sure. By the Bortle scale, my backyard measures on the SQM-L between the Bortle 6 and 7, overhead is generally about 18.5 mpsas. I also view from much darker skies.
All that said:
The 10.5 x 70 are hand holdable but they are heavy, they're not something I would want to use as my main binoculars unmounted. 10x50s are much easier on the arms.
Also, what is your dark adapted pupil? The 11x70s provide a 6.4mm exit pupil. If your dark adapted pupil is close to 5mm, the 11x70s may not be any brighter than the 10x50s. My dark adapted pupil is somewhat larger than 7mm.
As far as what I see: The 10.5x70s definitely go deeper, I see more stars and I nebulae are brighter. A good example is M-6 and M-7, they're just more detailed. M45 is similar. I can really accurately describe what I see in terms of M42, I see more, it's brighter but I have seen M42 so many times and very often in quite large aperture scopes so it's relative.
The trade off is the weight and the narrower field of view. Roaming the skies with a 6.5 degree field has its own charm, brings to it something more.
- I also have a pair of 15x70 Orion Resoluxs. These offer a 4.4 degree field with a 4.7mm exit pupil. I use these considerably more than the 10.5x70s, that extra magnification really brings things out. I can hand hold them but again, not for a long time.
I think everyone needs a good pair of 10x50s, they are just so versatile. And then on top of that, 15x70s are a nice step up.