Of the Dremel style tools, the Dremel is the best, but you have to accept it's limitations! They are not designed for continuous use, so if you use 'em a lot they will burn out! Having said that, they do actually do the job they are designed for. Many other imitations do not!
If you want more power, not to mention a lifespan in a different league, but still want an electric tool, you are better off with a tool that uses a fixed motor and a flexible shaft! Industry standard, here in the U.K. at least, seems to be the 'Foredom', and I've seen these decades old still going strong! The tool itself is easy in the hand and they usually come with a foot control, which is great!
The better option, if you can get a compressor, is a die grinder! The bigger ones are probably too big, but if you get a small one with a 1/8 chuck it'll be little bigger than a Dremel but do so much more!
I rely on my Desoutter one so much that I've got a spare just in case! It gets used for Grinding, cutting, polishing - the lot, and you can use tools such as aggressive burrs that a Dremel could never turn!