Ascended Amulet Off/Def/Utility slot
You could min-max with a 5AR/5power infusion which costs around 80 gold. That allows you to go a little bit higher in fractals. If that’s not your cup of tea, I’d strongly recommend utility.
Regardless, if you don’t have AR yet, you can put a versatile infusion into any slot which allows you to farm FotM until you have a ring or back and infuse that one. AT that point you can replace the versatile infusion with any utility infusion.
tl’dr: take utility. Except for the most elitist players, defensive or offensive on neck makes no sense.
Delayed content is eventually good. Rushed content is eternally bad. ~ Shigeru Miyamoto
I should note that if you want to min-max, the WvW infusions come with +5 to a stat as well, and cost 5 laurels and 125 badges, but give 1% increased defense/damage against guards/lords instead of AR.
“Memories are nice, but that’s all they are.”
Thanks for the valuable input both, I haven’t started doing any FotM yet and I suppose AR is only needed above lvl 10 which will take some time for me to get to. And I am not a pvp’er/WvW so gonna stick with utility slot for now.