We (Clerky) only support Delaware because that's where practically all startups (as opposed to regular small businesses) form. In case it's helpful, we've put together a pretty extensive explanation of why Delaware has come to be the standard for startups: https://handbooks.clerky.com/startup-incorporation/where
If you're not forming a startup and are considering Wyoming or Nevada, then I think whether you use an online service (like a registered agent) or an attorney could depend on whether you're just looking to have an entity for the sake of having one or if it's possible the paperwork will be important (e.g. if you have business partners). Unfortunately, there are no major online services similar to Clerky (in terms of legal quality) for Wyoming or Nevada, that I'm aware of, so if you fell in the latter category, I would recommend talking to an attorney. But if not, an online service could be fine.
I'm a co-founder of Clerky — I think it really depends on your needs. If you're starting a true startup (as in you are going to optimize for growth, might raise money, etc.), then you'll be better off either using Clerky or working with a good startup attorney, or both. The reason for this is because there is a lot more you'll need to do beyond just incorporation, and we have products for that. Incorporation just causes the corporation to exist, nothing more. No one even owns any shares right after incorporation. The odds of someone getting all the paperwork right on their own if they're not a startup attorney are basically 0%.
Even for incorporation itself, if you do it on your own or work with a registered agent, it's likely that you'll end up needing to at least amend your certificate of incorporation later. Most of the self-help / registered agent resources out there are for regular small businesses, not startups, so the guidance is not really what startups need. Some people like referring to every new business as a startup, I think because it sounds sexier to be working on a startup than a regular small business.
However, if you're starting a regular small business — i.e. not a startup — then I would say using Clerky is not a good idea. We're really purpose-built for startups and don't attempt or purport to serve regular small businesses. Whether you should use a registered agent alone is another question. At a minimum, if you have business partners you're starting the business with, I would say you probably should talk to a business attorney rather than trying to go on your own. On the other hand, if you just need an entity just for the sake of having an entity, and don't really care about whether the paperwork is done correctly or not, then just working with a registered agent directly could suffice.
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