I tend to think that in many - maybe most - cases, there is not only one "feminist" argument. It's entirely possible that there can be various viewpoints within a feminist perspective on issues, and that includes things like prostitution or surrogacy. In both there is a weighing of pros and cons, and there can be differernt elements that some give more weight to than others.
It's the same with any svhool of thought you can think of. There are all kinds of disagreements within the civil rights movement. There are all kinds of disagreements within Marxism. And so on. I don't love the approach of simply declaring that people who take another view have abandoned the whole set of principles. It's usually not true.
Personally, I think there is some real merit to seeing surrogasy as dangerous to women, but if we are looking only from the perspective of the adults in the equasion, there is also something to be said for the choices of the woman carrying the child over who own body. ANd then all that becomes more complicated when you consider the larger effects on society. Many of which are nothing to do with feminism but are very real.
However, the most fundamental issue for me with this is the rights of the child, including the right to not be sold, traded, or used as a gift, and the right to a relationship with its parents - which include the surrogate because biologically she is the real mother just as much as the one donating the eggs. And that, I would say, is completely opposed to the very idea of surrogacy, and is far more fundamental than any right a woman has to bear a child to give away or sell, or to have a child through any means necessary.