It depends.
Both cards work great with newer games. If your strapped for cash, there's nothing wrong with the Acekard 2i. Still gets great support from AKAIO, and has no trouble playing newer games [depending on your microSD card. I haven't had a single problem though].
But if you want near perfect SNES and GBA emulators and don't want to settle for the homebrew emulators that you can put on the Acekard, then get the DSTWO. It's just as good as the Acekard 2i at playing newer games, little better, but they're pretty much even.
The DSTWO is $35.00 however. But you get a built in GBA and SNES emulator. It's not the best, about 90-95% compatible with games. You get a lot more features for games than the Acekard such as text walkthrough, Real Time Save, Real Time
Cheats, slowdown and some other cool features.
DSTWO @ www.shoptemp.com
But if you just want to play DS games, the Acekard is the best choice, as it's cheap, but still arguably, the second best flashcard available.
Acekard 2i @ www.shoptemp.com
QUOTE(Rydian @ Dec 2 2010, 09:37 AM)
- DS / DS Lite
The card will work on an original (fat) DS or a DS Lite.
- DSi / DSi XL
The card will work on a DSi or DSi XL as well.
- Game Updates
Firmware updates are what let cards play newer games, these are the life-blood of the card.
- SDHC
SDHC refers to SD cards larger than 2GB (gigabytes). If there's no SDHC support, you can only use SD cards up to 2GB.
- WiFi Update
The Acekard 2i can update it's cheats (and get minor bug fixes) over WiFi without having to connect to a computer.
- Clean Mode
The DSTwo has special features to ignore AP in most games, letting you play them without having to wait for a firmware update first.
- RTS
The Real-Time Save (Save State) function lets you save and reload your game progress at any moment you wish.
- In-Game Guide
You can pull up text files and images in-game, in order to check a walkthrough or map you downloaded at any time during a game.
- Slow Motion
The card lets you slow down the game speed as you wish.
- In-Game Cheats
The card lets you create and modify cheats while the game is running.
- Special Homebrew
The card has multiple pieces of special homebrew, such as it's own GBA and SNES emulators, as well as text/PDF reader and video player.
- Battery Life
Unfortunately the DSTwo's extra CPU and RAM (which give it the special features) eat into the battery life a bit.