Whatever you get: Magazine-fed, semi-auto. No bolt-action rifle I'm familiar with offers the option to go to rapid fire if something happens that needs it, and very few (if any) bolt-action rifles allow to load lots of rounds in them. Both of those capabilities could become necessary in a fight or a situation that might shift the conditions of a fight on you with little or no warning. More flexibility, more options, more benefit. For those that push accuracy, are you more accurate than the rifles you have already? If not, I'm not sure a lot more accuracy is useful to you, considering that there are semi-autos that offer MOA and sub-MOA accuracy out of the box.
Sure, you can if necessary throw down the bolt-action and pick up the semi-auto, if you happen to have both of them available. When the bad guy pops up on your flank 20 yards away or kicks in the door two rooms down when you're scoping one 200 yards distant from your prepared shooting position, what would you prefer? Traverse and get one shot (counting on that one snap-shot to be a hit and enough to drop them right there) before they lower the boom, drop the rifle in hand and try and scramble to get the other one up in time, or change the position and start pulling the trigger?
Semi-auto, magazine-fed. You can hunt with it and you can fight with it. You can do either with a bolt gun, too. But the fight for life, which I focus on here, is much better done with the semi-auto and a big magazine full of rounds (and more behind that one).