What Items Are Best For Each Subclass

Never used Artificer before and wondering what magic items y’all recommend to optimize each subclass and playstyle 

(thanks for suggestions/advice if I get any)

There are plenty of guide out there for that sort of thing, just do a google search. Like this one! https://dungeonmister.com/guides/classes-in-dungeons-dragons/artificer-dnd-2024-guide/

For an armorer subclass, mithral plate armor doesnt give disadvantage on stealth, so if you choose the Infiltrator armor, you get to roll your stealth checks at advantage, instead of advantage/disadvantage cancelig out.

For magic item replication, at level 10, you will likely end up choosing things like elemental gems so you can summon 1 earth elemental.per day.

Defo will, thanks.

For any artificer, if you're allowed to choose it, an All-Purpose Tool is very nice. +1 (or more) to spell attacks, spell save DCs, all the tools, plus a free cantrip.

After that, it's nice to be able to have items that you can't replicate or items that you would ALWAYS replicate. So some sort of nice armor - it's great that you can make it for yourself, but better if you don't have to and can save that slot for something that could be more situational. Same if you're wielding a sword. 

I like having a Bag of Holding on an artificer, because it's in the nature of the character to be gathering bits and bobs and items. If your party tracks encumbrance, it will be essential. If it doesn't though, it still feels nice, and again if you have a permanent one you don't have to replicate it.

Magic items that give you access to spells or capabilities that aren't on your spell list are nice too, whether consumable or permanent. But which items those are for you are probably situational - what does your party need? 

Items that don't need attunement are more valuable than those that do, because even though you get more attunements than other classes, it's a limited resource.

The more you can make your Replicate Magic Item list be items that you're comfortable swapping around, the more flexible you'll be in bringing exactly the item you need to a particular encounter.