Have been giving the exact same recommendation for many years
6/8 Roundnose half hollow
Why ???
It is the middle size so you can then decide to go larger or smaller on your second razor
Roundnose gives the illusion of safety, and might save a nick or two
Half Hollow, again the middle grind so you can go heavier or lighter next razor
The 6/8 size razor have a slightly larger and heavier heft and tang then the next size smaller and a lighter and smaller tang and lighter heft then the next size larger they are a size unto themselves
The slightly larger size helps keep them flat on the strops which is an issue for newbs
The slightly larger size helps keep the flat on the hones if you decide to
The size and heft help with those tentative first shaving attempts
The slightly stiffer grind helps with those first shaving attempts
Of course it is your face and you know best but you did ask
edge longevity -
It is the steel / HT not the grind that determines longevity if you eliminate the honing aspect of course
The stiffer grinds were often stamped "For Heavy Beards" (etc) which led to the assumption that the edges lasted longer or were tougher.. But the stiffer grind helped to "Plow" through a heavier beard because of heft and the lesser blade flex...
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