How do you value US stock options when you live in the UK?

I’m currently weighing an offer from a US-based Series C startup, but I’ll be their first senior UK hire. Because they’re still in the middle of switching their global HR stack, they’ve told me I can actually choose between being onboarded via Deel or Remote.

The base salary is great, but the equity is the sticking point. They’re offering NSOs, and I’m trying to figure out if it’s worth the tax headache. As I understand it, Remote has a much more robust in-house equity module for handling the UK tax withholding and 'Readily Convertible Assets' (RCA) rules, whereas Deel sometimes leans on third-party partners which makes the tax reporting a bit more opaque.

I’m worried about the CGT implications and potentially getting double-taxed if the reporting isn't airtight.

For those who had a choice, did you find one platform handled the stock exercise and NICs better than the other?

Does an entity-owned model actually make the year-end tax filing easier for the employee, or am I still going to need to pay a specialist tax advisor £500 just to untangle my self-assessment?