There is no time difference between Budapest and Vienna. Both cities use Central European Time (CET/CEST, UTC+1/+2). When it's 12:00 PM in Budapest, it's also 12:00 PM in Vienna.
Both cities observe daylight saving time on the same schedule, 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.
Budapest and Vienna are neighboring capitals with deep historical ties from the Austro-Hungarian Empire. Today, they're connected by frequent trains taking about 2.5 hours. Both are major European cultural and business centers.