The biggest reason is access to capital. There's lots of institutional investors who are going to primarily invest in US equities, so if you're on the US stock market that's good. Even if those institutional investors do look at worldwide equities they're going to be limited in how much they allocate to it. It's also easier for investors - a single regulatory environment, no currency risk etc.

This used to be mitigated by the fact that other countries would have their own pools of capital, like domestic pension funds but with the reforms to pensions UK pension funds are no longer a particularly good source of capital on the UK stock exchange.

Way back when Arm were dual listed one of the explanations was that US based customers (meaning US based semi companies) preferred that the company was listed in the US and subjected to a similar regime, in addition to needed capital.

To be honest, that actually makes a decent amount of sense, but I suspect the real reason was to enable US investors to buy into it so they do not then support attacking the foreign interloper in their industry.

Generally it's easier from a compliance perspective to list in the same jurisdiction as your shareholders live. Otherwise there can be more admin work with withholding taxes etc.

Also a baseline of liquidity, rule of law, and the absence of capital controls are prerequisite.

the access to investment probably?

more liquidity