Although I think it will be a cracking trip I don't think the W2W is easier to be honest. You don't get the big stiff climbs such as Hartside, Black Hill etc but there are plenty of step undulating sections spread all over the route and it is slightly longer.
Visit
www.cyclingw2w.info for more info on the Walney to Wear route as well as info on the newly opened finish section to Whitby which promises to be a belter.
Many people have made the C2C and Reivers into a round trip (visit Dean Grindles excellent Reivers site at
www.reivers-guide.co.uk for more details on this loop.
If considering a backwards C2C and then heading back on Hadrians Cycleway then Doug Ridgways HCW site can be found (for those of you who don't know) at
www.cycle-routes.org/hadrianscycleway which incidentally is a fantastic source of info on trouble spots on the C2C Newcastle and Tynemouth section.