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I'm more than happy with my master blaster and @hulsroy loves his hpx, tbh I doubt you'd notice much functional differences it's just a matter of taste.
One small note is that my topeak fits nicely above and below my top tube which is handy for frame bags
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Have two HPX in different lengths, work really well. I find the z-hose extension (link) really useful too, avoids yanking around the valve stem and the gauge is useful (although obviously not perfectly accurate).
Topeak master blaster or zefal HPX (frame pump)?