Vassar’s ED admission rate was 33% on its SY23-24 Common Data Set, while its overall admission rate was 18% (source). There may be a slight bump by applying ED, but there are also many applicants accepted via ED who were prescreened during the athletic recruiting process. Thus, ED rates at most schools are higher even when the chances for regular applicants are not significantly different whether they apply RD or ED.
Just make sure that if you ED anywhere that it is affordable for your family and that it is your clear #1 choice and that you’ve visited the campus.