I would recommend Calgel or Bio Sculpture, the predominant soak off gels. Soak off gels have pros and cons, I however strongly prefer them over any other enhancement system for the health of the nail in removal, lifting isn't a problem, breaking one doesn't damage the nail bed, and they look more natural. Fresh sets are very easy to apply.
Calgel is harder but less colour options. Calgel is however prone to yellowing, there are treatments they offer to go on top that help with this.
Bio Sculpture is more flexible but can turn rubbery in time especially with people that get their hands in a lot of chemicals, requiring most often a soak off vs fill (for me personally I have to do a soak off with every other fill.) They do have some fantastic colour choices.