Which reroll helps me the most?

I have no way of taking G's d20with value 19, so it's clear I should take the d20 with value 12. But how? Should I use
my d20 alone since my other dice have relatively large values and I have a 5% chance of rolling a 20? Or the d10/d19 skill attack? or the d4-d8-d19 skill attack?


Button Men Game #707412
This game is 'for fun' and does not count for player rankings.

Tournament #15120: Friday like Soldiers Current Round: Round 1. (organized by TheUniverse)

Skills in this game: X Swing
Player: ElihuRoot *Dead Dude* *Fanatic*
Your Button Man: RandomBM (4 8 10 20 X)   Score: 30.5 (1 sides)   Rounds Won/Lost/Tied: 1 / 0 / 0 (Out of 3 wins)
Your Captured Dice: None

4-sided die	8-sided die	10-sided die	20-sided die	X Swing (with 19 sides)
1	8	9	14	3
4-sided die	8-sided die	20-sided die	20-sided die	X Swing (with 6 sides)
4	7	12	19	2

Opponent: Gryphon *Rage* *Fanatic*
Button Man: RandomBM (4 8 20 20 X)   Score: 29 (-1 sides)   Rounds Won/Lost/Tied: 0 / 1 / 0
Captured Dice: None