HotW lasts 50% longer, provides a bonus even when it's not active, and affects all your heals (including WG, shroom bloom and Tranquility). Which cooldown provides the most healing is going to depend on your spell breakdown for the fight. While NV grants +40% to rejuvenation, it's only +12% to AoE heals. HotW in comparison grants ~31% more healing for everything. Taking into account the much longer duration, HotW is going to provide significantly more "oomph" per activation.
In the end it comes down to whether you want the higher uptime of NV or the bigger impact per activation of HotW.