There is really no such thing as 'better' WiFi support - there is no difference between using a cart and a rom on WiFi.
@ AeroScap: Filing may not be required, but it's infinitely better than constantly having to attach tape to the microSD to get it out, and then taking it off to write files to it, and putting it back on to take it out. It was a terrible design decision to forgo the spring, as anyone with say, an M3 SD product would be used to, it's simply crap to not have.
@ troublesome: I own all the carts, and the G6 Lite & EZ-Flash IV Lite are INTENDED to be taken apart, as they each come with different cartridge casings. The EZ-Flash IV Lite's plastic casings are a joke, I've had cheap toys with a more solid construction. Heck, all but one of the cases included don't even align properly when screwed together! When you put an EZ-Flash IV Lite beside even the cheapest of carts, a SuperCard - the SuperCard looks like royalty.
GBA support is pretty much equal between the two, though the G6 Lite does contain the RTC (Real Time Clock) whereas the EZ-Flash IV Lite does not.
I am not a 'fanboy' of any one cart, but the G6 Lite clearly has advantages over the EZ-Flash IV Lite. If you've purchased the EZ-IV, please do not take offense when trying to defend it - it does have flaws, the EZ-Team is not perfect, and they really released a half-ass, shoddy product. If you like it and find it usable, or more likely spent the money and now can't get anything else, that's OK - but to prospective purchasers, it's only fair for them to be aware of it's problems so that they may make a more informed decision.