Thanks Rico, I had Ultravid 10x25...Now I don't use binoculars with magnification over 8x anymore because of the stability problem.
You were unlucky for the 10x25 out of collimation, you could have it replaced, because it is excellent and the resolution is fundamental for the observations of small and distant animals. But if you can't keep a 10x still and you prefer up to 8x maximum, there's little to discuss.
I forgot to say that I have a Docter 10x25, a binocular with a resolution at the highest level, but that after three days of use suffered a defect in the focus system.
I can only say that bad luck with 10x25 haunts you unscrupulously.
Seriously, when the choice is Ultravid 8x20 or Victory 8x25, I could agree with Alexis, if you can accept 290g every time you go out with the binoculars.
For example, I started with Legend 10x25 (235g) and I always wore it, on every occasion, attached to my neck for 25 hours a day or in a baby carrier, without realizing that I had binoculars with me, even when I went to go shopping, just in case. But now that I'm using an Opticron DBA Oasis 10x25 (347g) that I've even lightened to 310g, when I wear it I always realize I have it with me. Not that it is heavy, but simply that 250 g is better than 300 g, when the purpose is pocket-sized.
I feel lucky that I prefer and I can easily tolerate 10x25 compared to 8x20. Because 10x25 is more powerful, resolute and efficient than any 8x. So much so that if it were possible / available I would adopt 15x28 all the time. But as I said earlier, Leica designed and built 8x20 and 10x25 with the intent of offering the best pocket-sized solution in the world (for better or for worse). And unfortunately, Leica will never satisfy my desire for Ultravid 15x28 :re:
If I can give another advice, you try both Ultravid 8x20 and Victory 8x25 at the same time, before deciding.
Both Opticron DBA Oasis 8x22, and Docter 8x22, which Montana 8x22 (Bresser), are good wide-field binoculars like the Victory, but not so good. If you can spend the right price, get Ultravid or Victory. You won't regret the optical quality (I don't know Victory).