The all depends on what type of design and throughput you are looking for?
For example if you use AWS Native IPsec then you will need to setup a VGW which has a limit of 1.25 Gbps throughput
if you setup VM-Series to Device your limit is only the bandwidth and the performance capabilities of the devices you are using for VPN. That will probably be the main thing to consider but I am sure there is more.
Without knowing more about your use case, the decision around where to decrypt will come down to routing. In general, if you terminate on the VGW, there are very limited options to have the traffic route through the Firewalls due to routing limitations within the VPC. AWS typical recommends "Transit VPC" designs where remote traffic and/or spoke VPC traffic can route through multiple Firewalls in a fault tolerant fashion. You can find both manual and automated Transit VPC Options here.
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