Best Upgrade Strategy?

I've just hit L140. I've capped my upgrades, so each of my twenty TFs is now at L7 (basic Bumblebee still refuses to show up, though ...) Going forward, what's the best approach to further upgrading? Should I upgrade my earlier TFs (e.g. basic Optimus, basic Bumblebee, Soundwave, etc. etc.) first, or should I focus on upgrading my later ones (Ultimate Megatron, Ultimate Optimus, High Octane Bumblebee, etc. etc.)? I can think of reasons for each, as to why I might want to upgrade them first: - earlier TFs: give them a better chance of surviving any given run through an area - later TFs: take advantage of their high-scoring ability (i.e. the automatic 2x multiplier you get) Your thoughts? Thanks.
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