Comparison of VPN protocols: PPTP vs IPSec IKEv2 vs OpenVPN vs WireGuard
VPN Guide: Understanding and Choosing the Best VPN
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I can TL;DR it.
( Dont Use PPTP or L2TP )
Low powered devices or on battery : Wireguard / Ikev.
Open Source and security ? Open VPN ( Heavy ) or Wireguard ( Super Light )
Bad Signal or often dropping connections ? Use IKEV.
Otherwise mostly all cases Wireguard. ( in some cases OVPN might be more compatible )