Hi there! First of all, congratulations on getting interview invites! Choosing a date, especially with little time between the options should not affect your chances. That being said, wouldn’t you rather take the earliest possible date? This is what you have been preparing for and working towards for a long time, so not leaving things until the last minute could help you. That depends, of course, on how prepared you feel for interviewing. If you think choosing a date in January will help you prepare better and do a better job, then of course, that’s what you need to do. However, if you just want to wait until January because it’s more convenient based on other commitments you have, then it is all about priorities, and you should think what event in your calendar takes precedence over others. Hope this helps!