Comparison TUN/TAP - what is optimal mode?

[c.monty]

Hello!

My network architecture looks like this:
WAN <---> Router A <---> Router B <----> LAN

OpenVPN Server is running on Router B, and consequently I have configured port forwarding on Router A.
In my LAN, there are several systems running that I want to control from the WAN.
Furthermore I want to manage a service running in an internal network of Router A.
Any client of the LAN can access this internal network of Router A.

Question:
I want to setup a remote connection to the OpenVPN server from multiple clients (= mobile devices).
What is the optimal mode?
Bridging (TAP-Device) or Routing (TUN-Device)?

THX

[c.monty]

Well, I knew this advantages/disadvantages... however, my questions was addressing the pros and cons for the specific scenario, means multiple vpn-clients should connect to the private network (LAN) and access any service running in the LAN.

What mode should be prefered?

At this stage it's performance and availability is not relevant (I know solutions for Android using both, TUN and TAN).