Given how low your interest rates should be, I'd put it in shares, but....
Have you ever invested in shares before? If you have, then fine, I have nothing else to say.
If you haven't, try to think.. how would you feel/handle if you put in your 10K and the market dropped another 10%? If you can go, meh... it'll come back up, and that's only the first of many investments, then go for it.
If not, and many first investors do get very stressed if their first investment drops. I'd suggest doing it in two steps - maybe 5K now, and wait a month and then put in the other 5K. Most of the time when the market does drop, like it has now, it will kick along at the bottom for a while, and then it will gradually pick up. So you don't have to feel like, if you don't do it straight away, you'll miss your chance. On the other hand, you shouldn't procrastinate waiting for the right moment.