If you can help us understand your criteria then we can help you choose the best configuration. Is "best" the most simple configuration? If so then 2 separate links is more simple than Etherchannel and would be best.
Is to achieve redundancy the "best"? Both choices achieve redundancy but do so in different ways. The 2 separate links will use spanning tree so that a loop does not form. The spanning tree will put 1 link into blocking state to prevent a loop. So the result is that 1 link at a time can carry traffic and if that active link fails then the Spanning Tree must converge before the second link becomes active. An advantage of Etherchannel is that Spanning Tree sees the single Etherchannel and not the 2 individual links. So both links are actively carrying traffic with Etherchannel. And if there is a failure of one of the active links there is no need to wait for Spanning Tree to converge.
So most people would probably choose Etherchannel as best.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...