You could take some ideas from each to make a moderate version. Main this is what you are willing to put up with - either side of Strood / Rochester is about as bad as cycling gets, which is why the bumpy version goes so far south as most lanes within 10/15 south of there are awful awful awful. But to be honest the bumpy version is a great ride, and road only (if you discount the seawall after Reculver to Birchington)
You could take some ideas from each to make a moderate version. Main this is what you are willing to put up with - either side of Strood / Rochester is about as bad as cycling gets, which is why the bumpy version goes so far south as most lanes within 10/15 south of there are awful awful awful. But to be honest the bumpy version is a great ride, and road only (if you discount the seawall after Reculver to Birchington)
Busy version:
https://ridewithgps.com/routes/22635819
Bumpy lanes version:
https://ridewithgps.com/routes/26559758