bdd cloudflare argo has its own way of optimizing routes over the period, also it is built for making less hoping between edge locations where bunnycdn is obviously a cdn and does exactly what cdn do, make response time faster by lowering extra hoping..
there's no significant pro's or cons to either its just a matter of user preference and needs.. only difference i'd say is argo's pricing is on a premium side if you handle lot of traffic, and argo doesn't work like typical cdn, it figures out based on your traffic to where your routing of traffic should be done from, they i think also leverage local ISPs to deliver..
cloudflare has alot of edge locations that they can easily leverage that in argo amart routing, i think argo's main purpose is to reduce letency and bandwidth usage from origin..