Most set-top players should have no problem with +R or -R. Some very old DVD drives for computers were made for one or the other though. But probably any drive made within the last eight years or so should theoretically have no trouble (in other words, apart from being finicky or having some kind of driver or hardware glitch).
That being said, -R is the safer bet when authoring discs because -R is less likely to have issues.
I have a friend who has often been sent DVD+R from a guy he knows who is in his 90s. The guy has been told time and again not to send them and he does have other equipment that is DVD-R. His DVD+R is Philips who supported this DVD recordable type thus as Yamaha is the same or was design as Philips you can play +R on both OK. This guy tells me friend to get uptodate and go down the street & buy a Philips machine. This is pure arrogance. Worse is that he forgets to finalise discs so unless you have the same machine you can't use them. If you do finalising is no problem at the redeiver end.
But like BETA/VHS & other home video systems one system is enough. +R was supposed to be better for editing but I never bothered to try it. Having said that earlier issues redubbing DVD+R on the computer for DVD-R copies is, or seems, trouble free in my current drives(LG Blu Ray LG RAM DVD).
I used to use DVD+R discs about 8 years ago, I liked the way that, with the right software, you could change the DVD booktype to DVD-ROM. Now I stick with Taiyo Yuden DVD-R discs, which I think are manufactured to higher tolerances in Japan than rebadged DVD-Rs made in India and Taiwan.