I think the answer is more like "no, the trim has to match the valve." In this case, Delta. Not Moen, Kohler, etc. This would most likely include the handle. But as C stated, anything else can be whatever you choose, though you would most likely want to match finishes and such.

I stand by yes: "I was under the impression I'd be limited to Delta trim kits". Yes, you are limited to Delta trim kits.

Delta valve needs Delta trim. Which in practicality means all Delta unless you are doing chrome. Their gold, stainless, and nickel tend not to quite match others 100%.

Have your trim before you button up walls. Delta isn't bad but Moen is know for having their handles stick out very far were it looks like something is wrong when its their design.

I know it has plastic wall trim set but with some modern trim kits like Arra? it will look odd if it isn't set further into the wall. The more modern the trim the more its visible.

Good thing is those cartridges are cheap to rebuildable, bad part is they do leak at times.

Even if you are looking for trim kits from only a single manufacturer, they're not all interchangeable.

"I'm looking for a modern style without a sky high price tag."

The Delta Trinsic, Delta Pivotal Monitor, and Delta Zura look pretty decent and not too expensive.

Delta collections search: https://www.build.com/delta-collections/c113023

I have a GERBER single handle knob in my bathroom that I want to modernize... it does use a cartridge, but it seems most universal kits fits Delta, Phisher Or Moen... Can those universal trim kits that uses cartridges work for Gerber Faucets?

Wouldn't Brizo trims be compatible with Delta valves since they are Delta's higher end brand?

@Meg K: " Wouldn't Brizo trims be compatible with Delta valves"

Yes, in fact Delta sells the identical valves under both its Delta and Brizo brands but charges substantially more for the Brizo versions.