We haven't seen the limits of the Speed Force. We don't EXACTLY what it is. However there some issues that refer it to a fundamental aspect of Creation itself. Other than that it's pretty vague.
And I would rather have the OdinForce. Not because it's more powerful but because living at lightspeed would drive me insane.
How can anyone say the Odin Force "no contest." The Speed Force is directly linked to the Source itself, a much more powerful source than what Odin taps into.
So Flash is more powerful than all of the Skyfathers? Even more powerful than beings like the Highfather? Odin can tap into infinite resources of ambient magical energy and cosmic energy.
I know Flash is powerful, but can he manipulate matter? Can he create whole worlds out of nothing? Can he create a whole different races of people and creatures? No. Is Flash a god? No. Can he be a god? Yes. If Odin knew what the Speed force was, I'm most certainly sure that he could tap it as well.
With Odineforce, I'd be immortal Seriously, no contest on that. I'd take the Odinforce, because there's seemingly no limit to how you could augment yourself with it. Hell, if I wanted, I coud give myself the ability to run and think at light speeds and a body durable enough to survive it without the protection of the speed force.