The issue will be decided by effective logistics. Ukraine has shorter lines of supply. They have also limited the Russians ability by blowing up bridges, etc.
How it turns out, I do not know, but it will be tough going for both sides.
Winter is tough for anyone especially within a battlefield environment.
“The onset of winter will change the course of Russia’s SMO in Ukraine
The Wall Street Journal is sounding the alarm - they talked to the Ukrainian military, who said that in winter their troops could become more vulnerable:
“On the battlefield, the commander of one of the Ukrainian units in the east of the country said that in winter it would be much more difficult for his soldiers to hide. In the snow, Ukrainian vehicle tracks would be visible to Russian drones and could be used to pinpoint the exact location of the soldiers. In addition, if the soldiers light a fire to keep warm, they will also be noticed.”
Mykola Beleskov, a consultant with the National Institute for Strategic Studies of Ukraine, also confirmed that hiding in winter would be much more difficult:
“We cannot fight the way we used to, in spring and summer. Moreover, Ukraine will need additional fuel to keep Ukrainian equipment from breaking down.”
https://t.me/intelslava/39974