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Those are two different tasks and they require different tools. Buy a hammer drill for drilling. If you plan on doing a lot, buy a Hilti. If you're only talking about a few small screws or bolts, just about anything will work.
None of the smaller, electric hammers are worth a damn. Anybody that removes concrete for a living uses an air compressor and a 90 pound hammer. I'd suggest renting whatever you need. Consider having the concrete sawn, if you are removing a bunch of it.
JR
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