Sahih Muslim
756.01

Jabir reported Allah's Messenger (ﷺ) as saying:The most excellent prayer is that in which the duration of standing is longer

756.02

Jabir reported:The Messenger of Allah (ﷺ) was asked about the prayer which was most excellent. He said: That in which the standing is longer. (This hadith is narrated by another chain of transmitters too)