If you get the Cryorig H5 Universal , not the Ultimate , there is 0 ram interference , The Phanteks is much larger , has possible ram clearance issues , but does cool a little better , I own the H5 Universal and 2 Phanteks , I love both.
User reviews state that the Cryrig H5 installs easier, and has better clearance for heat spreaders. I own a Cryorig, and it's the best air cooler on the market.
If you get the Cryorig H5 Universal , not the Ultimate , there is 0 ram interference , The Phanteks is much larger , has possible ram clearance issues , but does cool a little better , I own the H5 Universal and 2 Phanteks , I love both.