The new Cannondale Topstone Carbon Lefty is basically the same as the standard Topstone Carbon, but now with a suspension fork and a switch to 650b wheels and tires. The changes sound modest on paper but the difference you feel in the saddle is far greater than you might expect, and while that Lefty Oliver fork adds a fair bit of weight, it more than makes up for it in terms of capability and sheer fun. More importantly, it arguably makes for a more balanced and cohesive machine than the standard version.
If mixed terrain is more your style, the standard Topstone is still the better choice. But if your idea of gravel riding leans more toward the off-road end of the spectrum, this is the Topstone to get.
Full article/review: https://cyclingtips.com/2020/05/cannondale-topstone-carbon-lefty-review-suspension-makes-it-better/