Mick,
?I've wondered the same thing. I started off with a Lite VNA 64. It was regarded as the best small handheld inexpensive VNA at the time of purchase a few years ago. It was only about $150. It's really cool for what you get vs cost. Handy..
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When I decided to get into tuning these cans & to have some more equipment I looked into other devices. From 30yr old professional equipment with floppy drives & CRT displays to newer VNA within the budget. The 2nd device I picked up was called the LibreVNA for about $600. It's a two port VNA that hooks to the PC & software as a means to view things. That gave me 90/100db of dynamic range. Plus it was easier to navigate & set things up like markers & more over the Lite VNA 64. I knew the duplexer would exceed the dynamic range of that device. So I ordered a Siglent SSA3021X + Spectrum analyzer with TG for about $1800. To try & help get the rejects dialed in. Plus I figured it would be useful for the hobby. I used those to tune the duplexer. Then here just a couple months ago I picked up a Measall KC901J dual port VNA for about $1300. It's pretty nice & has lots of extra features as well. It's still only 100db of dynamic range. It's appeal to me over the LibreVNA was It's a self contained unit with It's own display.? Plus it was highly regarded by several people as being good quality for the cost. I've actually seen it go past 100db of dynamic range in these lower VHF ranges of 2M.?
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I know all together I spent a good bit for all 3 items. I could of probably got a pretty good used old VNA. I don't really regret it though. I have some poor luck. I'd probably buy an old one then have something fail on it that's hard to get replaced. ??
N4FOX