Which Flashcart can Work on the 3DS XL 9.8.0-25 U? Sky3ds or R4i Gold

I'm a 1st Gen R4 user and was looking at ways for my R4 card to play on my 3ds xl. Unfortunately I presume there isn't a way, and what I read was to get a new card, altogether. I definitely want to play the DS games on the micro sdhc card, I currently possess, but is there an R4 that will allow me to play both DS and 3DS games via the same medium? I saw you guys sell sdhc cards, is there anything different between those and something I could get? Thanks for any suggestions.

edit: I've alreagy got an r4i gold 3ds card flashcart from http://www.r4is.com/r4i-gold-3ds-rts-best-r4i-3ds-card-for-3dsdsids-lite-p-1.html to play ds games, and I will buy another sky3ds to play 3ds games later.