- or - doesn’t matter too much any more. Most players can handle both these days. If you have a very picky player you might try bitsetting the +R disks to DVD-Rom…so they look like a commercially made dvd to the player.
We would have to know the make and model of your burner to tell you if you can bitset with it (this process is also called changing the booktype).
It is probably best policy not to burn at top speed. If you have 16x Verbatim, try burning at 8x or 12x.