Now you are simply pushing it. Vita has been out for 2 months, 3DS for a year after nintendo went into panic mode (yes, it was panic) and slashed the price + released 2 Mario games (and really, you shouldn't quote Mario as evidence for anything - it's the only franchise together with MH that can push numbers like that).
For the most accurate data possible, I tried to go back to Media Create threads to the point where the 3DS was around 500-600k units total. I had to go back all the way to its second week of sales to do it.
At that time:
03. / 03. [3DS] Professor Layton and the Mask of Miracle (Level 5) {2011.02.26} - 59.138 / 178.728 (-51%)
05. / 05. [3DS] Nintendogs + Cats: French Bulldog / Shiba / Toy Poodle & New Friends (Nintendo) {2011.02.26} - 44.699 / 108.912 (-30%)
08. / 06. [3DS] Samurai Warriors: Chronicles (Koei Tecmo) {2011.02.26} - 30.112 / 79.438 (-39%)
11. / 07. [3DS] Super Street Fighter IV: 3D Edition (Capcom) {2011.02.26} - 16.974 / 61.624 (-62%)
12. / 08. [3DS] Ridge Racer 3D (Bandai Namco) {2011.02.26} - 15.810 / 54.036 (-59%)
13. / 15. [3DS] Winning Eleven 3DSoccer (Konami) {2011.02.26} - 15.301 / 39.857 (-38%)
3DS was sitting around 580k total hardware sales.
3DS software of just these 6 games was ~500k.
For comparison, as many recent Vita software as I can find:
14./03. [PSV] Tales of Innocence R <RPG> (Bandai Namco Games) {2012.01.26} (¥5.980) - 8.397 / 63.250 (-85%)
02./00. [PSV] Gravity Rush <ACT> (Sony Computer Entertainment) {2012.02.09} (¥5.980) - 43.462 / NEW
09./04. [PSV] Ragnarok Odyssey <ACT> (GungHo Online Entertainment) {2012.02.02} (¥5.985) - 8.117 / 41.614 (-76%)
For these, I had to go back to Vita's first week because no games other than the three above have charted in the top 20 since then:
07./00. [PSV] Hot Shots Golf: World Invitational <SPT> (Sony Computer Entertainment) {2011.12.17} (¥4.980) - 61.412 / NEW
08./00. [PSV] Uncharted: Golden Abyss <ADV> (Sony Computer Entertainment) {2011.12.17} (¥5.980) - 48.224 / NEW
18./00. [PSV] Dynasty Warriors Next <ACT> (Koei Tecmo) {2011.12.17} (¥6.090) - 29.181 / NEW
19./00. [PSV] Lord of Apocalypse <RPG> (Square Enix) {2011.12.17} (¥5.980) - 28.742 / NEW
Vita is currently sitting at 566k.
Vita software of any game I could find(7): ~300k.
Let's make it interesting and eliminate first parties:
3DS: 413k.
PSV: 163k
If you really want to compare sales between the 3DS and Vita, third party or first party, it's a losing battle right now. Especially since we have no idea how many digital sales there are.