APM's Advantage over AWS VPN

For this you need to know the two systems to compare them and better as the vendors for PoC and in the PoC ask for comparison.

What I can add is that AWS VPN may not have good posture checks for the VPN users as F5 APN is not only VPN consetrator but it supports posture checks, Single Sign On (SSO), SAML SP/IdP, Oauth etc.. and much more. Also F5 APM can use DTLS for the remote VPN as SSL is causing slowness sometimes ipsec or dtls is better:

https://techdocs.f5.com/kb/en-us/products/big-ip_apm/manuals/product/apm-authentication-sso-13-1-0.html

https://support.f5.com/csp/article/K54955814

Also the F5 APM can be used as SWG with correct license:

https://techdocs.f5.com/en-us/bigip-15-1-0/big-ip-access-policy-manager-secure-web-gateway/big-ip-apm-secure-web-gateway-overview.html