If there’s a specific customization you have in mind, feel free to reach out and we’d be happy to let you know if it’s something our software would support.
I regularly work with companies that use all of the above. All seem to produce decent documents. You can also compare their sample documents against ones from CooleyGo [1] and the like.
There are things you may desire as a founder that won't necessarily come standard in template docs from Clerky/Stripe/Gusto. Single-trigger acceleration [2] is the obvious example I can think of right now but I'm sure there are others.
Also, be sure to do your 83(b) election ASAP -- definitely within 30 days of incorporation. [3]
(Not a Cooley shill - they just produce good content.)
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[1] https://www.cooleygo.com/documents/
[2] https://www.cooleygo.com/what-is-double-trigger-acceleration...
[3] https://www.cooleygo.com/what-is-a-section-83b-election/