Tankless water heaters are small, lightweight, and easy to use. It also consumes less power. I found a helpful review site here http://www.wisecull.com/best-electric-tankless-water-heater/
If you're going tankless you really can't go wrong. Sure, they're expensive up front and the volume is a little smaller maybe than a standard tank water heater, but there's a lot of upside to a tankless water heater. One of the most important things to remember though is to always schedule regular water heater maintenance every year or else the system can start to develop problems if left idle too long.
I followed this guide on choosing the best tankless water heater when I bought my Rinnai a couple months ago. Never been happier!