Hard Gel vs Acrylic
Hard gel is more flexible and stronger than acrylic, but it's not as hard. Someone who is used to acrylic may feel that hard gel is weaker, but that is not true. Hard gel can withstand greater pressure, and it is less likely to break or crack than acrylic.
What is hard Gel: Hard gel similar to acrylic in its chemical makeup. It's made of monomers and/or oligomers (chains of monomers) plus other ingredients that help the gel remain workable, adhere to the nail, harden properly and resist yellowing.