I'm applying for a gen surg residency and read on other posts that one of the recommended M4 electives is cardiology. I have the option of taking cards but was also wondering whether heme-onc might be useful for surgical oncology in the future. I am not particularly interested in pursuing surg onc (or cardiothoracic surgery) as a career but would still like to enter intern year with a broad base of information. Looking back, does any resident or attending have advice on which one to take? Thanks!