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"Best way"?
Internet connection, for both sides, support "normal" Internet access? If so, "best way" would be stop doing that.
If Internet connection is devoted to just your business traffic between two of your sites, you shape egress traffic for bottleneck bandwidth (usually the lower guaranteed bandwidth for either site) and use QoS to prioritize your traffic. In your case, class-default FQ might work, if not, if your IOS version supports HQF, multiple classes using FQ, with extra bandwidth defined for your RDP should do. (The latter might be the "best way".)
