The problem here with conventional angle stops is they use a rubber washer and rubber stem packing...
They were OK until the water company switched to chloramine which eats up rubber... anyone that has fooled with a rubber washer exposed to chloramine around here knows it stains everything black as it disintegrates...
Now even the toilet flappers/ballcocks sold are listed as chloramine resistant... because that was another mess.
About 30 years ago the Plumbing supply got a line of 1/4 turn angle stops made in Italy... cost more than double what the old angle stops cost but boy were they nice...
Somewhere they started being made in China... now it is hit or miss as to quality...
At work, for the steam valves there are some American made ball valves I like a lot... installed by me in 1995 and still on the job...
I'm willing to pay more for quality since any problems down the road will most likely be my problem...
The house flippers around here buy cheap, cheap, cheap on anything that is hidden... so the low end market is alive and well...
PEX had never caught on here and code is probably why... one city says all domestic water must be copper... another forbids ABS for DWV above ground... another bans and ABS or PVC for under sink traps...