I keep several HF's mid-range (~$20 sale) corded angle grinders ready to go. One with a grinding disc, one with a wire wheel, one with a cutoff and another with a cutoff mounted in a Klutch angle grinder holder (mini cutoff).
I don't use an angle grinder a whole lot, but when I do I don't like to have to mess with changing out discs any more than I have to. The HF models have gotten it done and have lasted years.
Very recently I got a Dewalt 20V grinder. I got a deal (free) on several 20'x6'x6' shipping racks made out of 1" & 1-1/2" sq steel tube as long as I agreed to get it out of there right away. Naturally it was all nowhere near electricity, so ran down and bought the 20V right then. It's definitely not as powerful as corded but one 5Ah batt got them all cut up so it would all fit on my trailer. I suppose if all i have is a bolt or two to cut off it will be my go-to, but for anything more corded is the way to go.
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