First hand from a member of the Voyager cast -
Voyager had a fairly upbeat atmosphere on set - cast 'hung out' off screen and enjoyed each others company. The cast member in question decided to visit the DS9 set on the neighbouring lot but found the staff and cast to be rather unwelcoming, keeping themselves to themselves and very little in the way of on set bonhomie. In fact he found them a thoroughly miserable bunch
Garrett Wang told a very different story in a long podcast I listened to a while ago. He said the Voyager set wasn't that great. Specially Mulgrew was really a pain when Jeri Ryan showed up.
My point being: Take these stories with a grain of salt.