I use my wireless Q20+ (Anker Soundcore)all the time and have no problems with delay. The q20 line sounds pretty good for a phone you can get on sale for under $50 but does have a mechanical design flaw … the folding ear cup will fall apart at its joint after two to three years of use. The higher end soundcores uses a different design.
On the Sennheisers … I’ve had a few but only wired … the 2 open backs I’ve owned HD650 and HD595 were very good … the closed back one (don’t remember the model)… not so much.
