Hey Meussig, I've got the Huawei Ascend W1, bought it after my Lumia 710 died. Next device will be one with some more storage capacity and a larger screen, I'm going to do some research on 1320, 920, 925. Actually I would like to have the Nokia Icon but for now the price tag is a bit to high for me.
Developing for WP is great!.. recently published my
EasyAnalytics apps in the store.
If more storage capacity is one of your major concerns, I'd slash out the 925 right now since it only has 16 GB on board.
The 1320 is pretty solid of you could live with the 5MP camera. 8 GB internal only though but you can add external storage up to 64GB.
The 920 is still nice right now. I have a 920 and I really love it. 32gb on board storage, no external SD card slot though. I'm not sure how much you need but with 32GB, it's more than enough for mostly everyone.
Screen = Depends actually. Obviously the 920 has more PPI compared to the 1320 but the 1320 has a larger screen. I saw the 1320 and it's really a nice screen. I'd give this one to the 1320
On board storage = Lumia 920
Camera = Lumia 920
Battery life = (Going on paper) Lumia 1320 with 3400 mAh compared to the 920's 2000 mAh but mileage varies on every user as we use our phones for different purposes
External storage = Lumia 1320
Other specs are really identical.
Oh and one other thing that you may already know but I'm still going to point it out, you can't install apps on the SD Card but this may change with 8.1. The 1320 only has 8GB of Internal storage.
My verdict still depends on your use
Get the 1320 if you want a large screen, external storage and much better battery life
Get the 920 if you want a decent screen that is just 0.5 in bigger than your current phone, bigger on board storage (for apps) and a better camera
Both have 1 GB of RAM
Both have Nokia Exclusives
Both are LTE Capable
Both have dual core CPUs (with the 1320 just being a little more faster with 1.7GHz compared to the 920's 1.5GHz)
and the others are really too close to call.
So your choice!