I need to pick a nice green mounding maple for the high-traffic section of my maple garden. I've narrowed it down to Waterfall or Germaine's Gyration. Is one easier to grow than the other? Hardier? Able to survive fall & spring windstorms? (no salt spray) I'm located in Ferndale, WA in zone 7. Both planting sites have full sun and will be above traffic on a grassy bank. One plant will be near a Shin Deshojo & a pacific fire circinatum; the other will be near a Shirazz, a Bloodgood, a coral bark, & a 10' rhodi. I'm interested in hardiness, seasonal color compatability and winter interest. Thanks for your help!