Clrnc if both are at their best Timber triumph easily. He is way better in tight spaces and technical ability to be more effective for us as a FB.
I'm happy to admit my early concerns following his return to the team at the end of last season about Timber's tendency to charge forward ahead of the ball too much and leaving us exposed were unfounded.
At the time he seemed way to eager to push up into AM positions ahead of the ball in our last game of the season which did worry me at the time that he may be another Zinchenko type who is a defender by position but wants to be an attacker. After his games this season though he has shown he is solid defensively and picks his moments to attack, and doesn't just go all gung ho like first indications seemed to me.
Like @RocktheCasbah , I love White, but Timber is quality. I can't say for certain he's better but what I will say in his favoir is we don't feel White's absence as much when Timber starts, and that's saying something given the chemistry White has with Saka and Odegaard. Also maybe shows just how good Odegaard and Saka are that they continue to play well and make their RB look good despite whoever steps in.