There is no time difference between Vienna and Budapest. Both cities use Central European Time (CET/CEST, UTC+1/+2). When it's 12:00 PM in Vienna, it's also 12:00 PM in Budapest.
Both cities observe daylight saving time on the same schedule as part of the European Union, so they remain synchronized year-round.
Any time works! Since both cities share the same timezone, you can schedule calls during standard business hours (9:00 AM - 6:00 PM) without any time conversion needed.
Vienna and Budapest were historically twin capitals of the Austro-Hungarian Empire and remain closely connected. They're separated by only about 250 km and connected by regular trains and the Danube River. Both are major Central European business and cultural centers.