Give us a photo, then we may be able to give better advice.
I would probably go with the grinder with a smoother rock disk on it. The smoother the disk the less "stuff" you will be taking off.
Depending on how much "stuff" you have to go through, I probably wouldn't use just an orbital sander. I might save that till after I got as much as I could of with the grinder then clean it up with the sander.
I just finished a bit of grinding on my project boat and I thought I did a pretty clean job with just the grinder. If you can brace your hand or arm against something when your grinding, you can keep it pretty steady and do a neat job.
Small is beautiful, simple, cheap, and easy......
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