Maximize upper pole fullness - which implant is a better choice?

Hello, I’d like to increase my upper pole fullness. I like the so called, “fake look”. Am trying to decide whether to stay with a slightly larger Natrelle SRX extra full profile implant that I do really like or switching to a Mentor Boost High Profile for my revision/exchange. If my main concern is upper pole fullness and a “round” or fake look which is the better choice? Is there another implant, more appropriate to my criteria I should look into and see/feel that I may not be aware of?