best asus router for torrent/openvpn client?

Hi, just checking, which is the better router for a gaming router that also runs torrents/openvpn client+policy based routing? i take it ram + cpu power is the most important things here. i currently have an ac68u and it really can die under the load of openvpn.. (ie: my games start having weird latency)

so asus ac88u , or ac5300u or something else altogether?