[etchalon]

I think both options have tradeoffs.

If you use a service, you're outsourcing your security to perhaps more competent people, but you're making yourself a larger target.

Self-hosting makes you a smaller target, but you're taking all the risk on yourself.

Neither is a panacea.

[KekDemaga]

I agree the answer is shades of gray. Personally I prefer self host because I am able to get more visibility on my threat model that way. If you aren't equipped to use that information then I see little benefit to it.