plus it seems the supercard has the best and fastest support (patches seem to be out within 1-2 days),
Again no. Let's take two recent examples:
1. Mario 3 on 3 came out, worked on SC, but not on G6. One day later a new G6 update was released which fixed it!
2. Starfox came out a week ago: Worked on G6, not SC. Today (nearly a week after the release of the game) the new SC update is released which fixes Starfox, which still cannot run in Direct mode on SC, while it can on G6.
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and the most compatability with homebrew.
Here you got a point. SCL beats G6L when it comes to homebrew. However it's not the best. The best still are SC CF and M3 CF (see ScummVM).
QUOTE
About GBA support, well... i just saw a post about a new SC firmware "GBA patch update to 2382
256Mb GBA game can be patched to RESET function, support real time save." so they are still working on it.