@src1988 I'd recommend them. The droplets are well priced and reliable, there's support for most platforms, but it's a case of supply and demand, the number of ubuntu users is higher than heroku, therefore support is easier to come by , added to this, 85% of questions asked have already been answered somewhere on the forum, or in the documentation.
If this forum were hosted in Heroku, I'd imagine that more users would use heroku, they want the nodebb experience (if the NodeBB forum looks good and works, so will theirs).
If you want to try Digital Ocean, I believe voucher code
ALLSSD10 will give you $10 of free credit (2 months of time on the $5 droplet). Get involved in their referral program too, for every $25 someone spends using your referral, you get $25. I've had my droplet for 2-3 months, and still got another 7 or 8 months left of referrals and free credit to use before I have to dip into my pocket. (If more people clicked my link, that would extend this... (Other referral codes are available))
Maybe NodeBB needs a demo forum that gets purged every 24 hours so people can play with the admin area and see how it all works) Or if anyone can do a voice like Morgan Freeman, we can record a Screencast of the backend explaining everything.