Honestly, they all work about the same. Cordless is fun until charges give less and less run time. Corded means dealing with the cord, but almost infinite run life for the average user. Always buy the cut off wheels in stacks because every job requires multiples.
And I'll second the harbor freight angle grinder for bigger jobs. Unless you are a pro running these things for thousands of hours, you don't need the dewalt or Bosch or whatever $150 plus grinder that looks so desirable. I like fun expensive tools but as an average dude that likes to mess with shit, $40 budget grinder works just as well. Cheaply cut off wheels and such work well too..again you may not get 30 jobs out each one.
This is one random guys opinion so take it for what it is.
Cheers!
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