Within my limited circle, I have had no problems with DVD- on home video machines. So I use them because they're cheaper.
But I beleive that DVD+ is compatible with more domestic machines, and is becoming more prevalent. Because of that the prices of disks are coming down.
If you really want to go for a single standard burner I would suggest DVD+. But prices of dual standard burners have also come down, so why not hedge your bets if you can afford it?