Okay, I've had a re-read of
my comparison post.
I've nothing much to add to the Blurb and Doxdirect comments. Just one thing concerning saddle stitched (stapled) publications. Doxdirect will saddle-stitch higher page counts than Mixam, and sometimes (not always) these are done with a 'spine' which make the publication look more like a book than a zine. No text can be added to this 'spine'.
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Having used Mixam for a number of stitched zines and my poultry book I've been impressed with the quality of the finished articles and the service and assistance provided. However, it does require a greater level of DTP experience than using Blurb or making a simple zine with Doxdirect. I've not made a hardback book with Mixam so can't say how they compare to the ones from Blurb, but the softbacks are at least as good if not better, and you aren't limited by the Blurb software only your DTP skills.
Mixam offers a much greater choice of cover and paper stock than Doxdirect or Blurb.
If new to this sort of thing then Blurb is the easy way in, but if you are intending to sell the publications Blurb is likely to offer the least scope for making money unless you can take advantage of their discounts - either one-offs or bulk ordering discounts. I'd also point out that the hardbacks are just perfect bound paperbacks stuck between board covers, not properly bound books, so (to my mind) they don't look as polished for a commercial publication. For one-offs and giveaways they are fine, but to sell I'd go with their paperback option.
Whatever route you take it's worth getting a sample made even if it costs a lot as it will save money in the long run.