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Switzerland, the French alps this year were beautiful, Italy has sketchier driving but is cheaper and great for food, the hillier parts of Serbia I did last year or the year before were great. It kinda depends on what we were able to do - a longer time period I might go for cheaper countries whereas if it's only a week or so I'd probably hit the big rewards, ie. big French/Swiss mountains.
Every country has good and bad bits but the big bang for buck stuff is also the more expensive. There's some amazing scenery in Montenegro - Pluzine/Durmitor for example that I'd totally hit again:
https://duckduckgo.com/?q=durmitor&t=ffab&iar=images&iax=images&ia=images
https://duckduckgo.com/?q=pluzine&t=ffab&iax=images&ia=imagesAny of the control points are worth exploring more:
https://en.wikipedia.org/wiki/Transcontinental_Race
where would you go back to in europe to tour rather than race?