i like the angle chuck, it's more secure than the ball chuck & easier to use but there are times they are a PITA when i use them on motorcycle front wheels with straight tire valves.
as for the liquid filled vs non liquid filled i thought about that before i decided to get the non liquid filled gauge, liquid filled gauges need to be exposed to the environment before use or it will not read properly, yeah i know you just pop the cap off & screw it on again & it'll compensate for the temps but i just don't like the hassle.
Here is Longacre on the liqiud filled info
http://www.longacreracing.com/articles/art.asp?ARTID=34
Its not a big issue to equlaize the gage, its a knurled screw that takes a second to twist half turn then back. Don't have to remove it completely. I can understand the reason of not liking that. Depends on your preference. Sometimes I use my Milton because I don't want to mess around with a hose attached.
I didn't get it for the liquid filled feature, I would have been juast as happy without liquid filled. Don't feel it has much benifit for a tire gage- but it doesn't hurt anything, besides the slight hassle of cracking of the gage body vent screw before use. The thing I do like on the one I got is the pressure holding.
The Longacre stuff is very nice. They make different gages with different features- digital, dial, liquid filled, pressure hold, chuck types.