For technical books with lots of equations, tables, and source code snippets, reflowing is not an option. You have to see the content laid out in the original format, or it will just be gibberish.
I have a 9.7" reader which works adequately for reading A4/letter-sized documents. The Kobo Aura HD has a higher pixel resolution than most of the 9.7" ereaders, so that's probably the one 6" device whose display can properly show the contents. However, I've heard some complaints about the actual PDF-viewing software on that device. So, the answer may be that there aren't any 6" ereaders that are good enough for reading technical PDFs at this time. There may be more high def 6" readers coming out over time, so waiting is probably your best option, if you can do that.
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