+1 to Volatile tools. If you have many alts and LWS3 Episode 3: A Crack in the Ice, getting unbound magic is super easy just farm winterberries per alt and consume it. Me suggesting volatile tools is more of a money maker thing as what the person above me said, and it's definitely a really good long term investment even though your focus is getting full sets of asc trinkets. Getting ascended trinkets is easy just farm berries rather than buying a set of UM tools over a VM one.
I suggest look at these sites for the values of VM and UM:
Volatile Magic - http://gw2lunchbox.com/IstanShipments.html
Unbound Magic - https://wiki.guildwars2.com/wiki/Magic-Warped_Bundle/research
I'll put a quick summary:
Volatile Magic Trophy Shipments - You earn a profit of around 50silver for every 250VM
Unbound Magic Warped Bundles(there are 2 variants ) - 500UM + 1gold: earns you 25copper
-1250UM + 40silver: earns you 50silver (this should be the one you're buying ofc)
for every 250VM: 50silver
for every 250UM: 10silver
correct me if I'm wrong with these values