Like it or not, it’s official that the 3G version of PS Vita downloading will be capped to 20MB. According to one of Sony’s representatives the limit is expected to be increased after the release. Then the 64kbps upload and 128kbps download speeds are also causing concerns whether the console will be able to deliver the smooth online experience or not.
Sony has said that they are sorting the issue out with the developers so that users are not affected by these speeds. Since i have Wi-Fi most of the time, i would eliminate the 3G version and will go for its replica with Wi-Fi support. It won’t be surprising at all if you change your mind too.