I just recently migrated myself personally from Fortigate to Opnsense, where I did look a bit into Mikrotik as #network irc folk tend to love it. Mikrotik to me seemed just odd as well (particularly emphasis to use a thick client app), and I've installed and run almost every (other) major vendor out there. In the end I opted not to use yet another completely foreign dialect router/firewall, at least opnsense is freebsd, which I can work with ie close enough to linux and entirely accessible.
Vendor rep is important. I really don't trust Fortinet much anymore in moving off them, when they have security problems, they're usually pretty bad/catastrophic, and you NEVER want to NOT have updates on their kit if facing the internet (which mine was eos). Cisco isn't much better. I don't see Mikrotik in the news very often, which I'd take as a win at least and have compelling enough hardware/pricing I'd see this is a relatively small thing soon patched.
I've also been using Opnsense in some networks recently, I like it so far.
Some of the networks I work with have some older Mikrotik gear (which the Opnsense appliances are going to replace), I've just never really quite liked it - it has every feature under the sun but the interface always just seemed a bit janky to me. I might be judging a book by its cover but the software has just never felt solid...
Vendor rep is important. I really don't trust Fortinet much anymore in moving off them, when they have security problems, they're usually pretty bad/catastrophic, and you NEVER want to NOT have updates on their kit if facing the internet (which mine was eos). Cisco isn't much better. I don't see Mikrotik in the news very often, which I'd take as a win at least and have compelling enough hardware/pricing I'd see this is a relatively small thing soon patched.