Which embroidery machine is better?

I often get question on what embroidery machine they should by. For I do embroidery designs for customers and some of them are new on

this and some others want to update there machines.
I'm experienced in digitizing and designing and their stitching turned out beautiful. I don't spend much time on machine embroidering and don't

have much experience on embroidery machines.
What embroidery machine do you use and do they get good stitching? Are they easy to operate?
Thanks for any advice.
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GL Stitch Studio
http://www.happy-embroidery.com