I have also had both of those and I felt the same way, I have fully switched over to the Magpul K2 grips. The K2 is more of a vertical grip than the typical ar grips, it feel great in the hand, and it is designed to place your finger in the correct position. At first I went with the Ergo's because I liked the rubber grips, not sure what has changed, but I am not a fan of that anymore. If you prefer the rubber, grippy feel then Magpul also offers the K2+ grip, which is the same grip as described above, but has a rubber coating on it.