Well, if your main OS is Linux, booting into Windows only to then launch the VM and boot into the OS you'll be using the most seems like a chore. Sure you could get it all automated, but it's not an elegant solution in my opinion (not like dual-booting is anymore elegant).
If you asked me, the best, seamless option (if Linux is your main) would be to use WINE (or preferably CrossOver Games if all you really need is decent support for games). On the flip side, if Windows is your main, it makes more sense to boot into that first, then load up a VM whenever you feel the need to go Linux.
If you asked me, the best, seamless option (if Linux is your main) would be to use WINE (or preferably CrossOver Games if all you really need is decent support for games). On the flip side, if Windows is your main, it makes more sense to boot into that first, then load up a VM whenever you feel the need to go Linux.