First of all some historical background:
The Red Army started its offensive against the city on 29 October 1944. More than 1,000,000 men, split into two operating groups, advanced. The plan was to isolate Budapest from the rest of the German and Hungarian forces. On 7 November 1944, Soviet and Romanian troops entered the eastern suburbs, 20 kilometers from the old town. The Red Army, after a much-needed pause in operations, resumed its offensive on 19 December. On 26 December, a road linking Budapest to Vienna was seized by Soviet troops, thereby completing the encirclement.
So idea is to have a camping with multiple nations per side. Soviets and Romanians on one side and Germans and Hungarians on the other. Battle is played out during late war, lots of high tier equipment is present. Budapest is beautiful with Buda being hilly and Pest being flat with lots of small suburbs on the east. Great Danube runs between them with iconic locations such as Parliament and Bridges. Map variety could be great.
Allies often fought alongside each other, so there would be no problems with splitting the player base.
Also, the Hungarians and Romanians have some good and unique equipment in their arsenals.
Danuvia 43M submachine gun - Danuvia 43M submachine gun - Wikipedia
43M ZrĂnyi - 43M ZrĂnyi - Wikipedia
Turan - 40M Turán - Wikipedia
IAR 80/81 - IAR 80 - Wikipedia
You all know how to use google so I won’t over paste links here. Just search for Hungarian and Romanian equipment WW2.
I would chose this campaign over Berling one any day. It just offers more possibilities, we seen Berlin few dozen times in different games. WW2 is much more than Normandy and Berlin, at least in my humble opinion.