You only get stats from one weapon glyph at a time is the main driver.
- you need to buy 2 Intricate glyphs for your weapons to be equivalent to 1 on your talis (in favor of Devastating on weapons cause they cost less)
- you need to spend twice as much glyph xp on weapons (in favor of Devastating on talis cause you upgrade them first)
In either case replace 2 with a higher number if you use more than 2 weapons regularly (but your primary weapon is the only one that really matters)
As for where to put Accurate, it’s on the tali you’re least likely to have alternates of cause in normal leveling patterns it’s the first glyph you need to max so you want to only do that once. There’s no one best option; head/finger/neck have weapon-specific signets, waist has weapon-specific talis but also a high priority signet to max out, and occult/luck have multiple useful signets. So it depends what you want variety on.
If you only intend to build 1 gear set accurate placement doesn’t matter.