Geez, they're both fucking gorgeous. But I've always been a big fan of Isis Love, so she gets my vote. She's one of the most versatile pornstars out there, and post boob-job she is amazingly busty.
As someone mentioned, Isis Love post boob job is a fucking rocket, and blows most other stars out of the water. There's really no comparison. Isis Taylor is a bombshell too, but she's a few levels below Isis Love.
Isis Taylor... her bubble butt is too perfect. And when she gets dolled up she is smokin hot. Isis Love is good... really good, but I gotta give it up to Taylor