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[Japo]

With my older machine I had a DOS 6.22 partition, while Windows 98 in the main partition. Some games worked in 6.22 and not so "rebooting in DOS mode" with Win98 (i.e. DOS 7.1). For example Star Control II, Crusader: No Remorse, Fields of Glory, Lords of the Realm, Syndicate, and many more. So I'd choose 6.22, it was designed with compatibility in mind and 7.1 wasn't. No idea about FreeDOS, but I'd still bet that 6.22 is the most compatible with games designed for DOS 6 and lower.