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Considering how far we are in the hand, I'll be glad to be at least tenpai.
I'll discard .
It's the safest tile, improves the hand, and I don't see any real fireback.
If everythings works well, the hand will become sanshoku+dora+riichi ... enough to reach second place if east or west player discard the winning tile.

, and are too dangerous.

Agree on the 9-pin. Keeping the 4-man creates a closed wait for the dora 5-man. So, that's a definite improvement. In addition, the potential for a 7-8-9 sanshoku is still permissable; although, the bet for attaining it at this point isn't a great one.