Last time I played the DS games were about a year or two ago, Now that I have come back to the with me new 3DS, I have updated my opinions on them.
Gameplay
DoS- Pretty Fun, but too easy. Julius mode cranked up the challenge a bit, but still too easy.
PoR- from being my least favorite to my most favorite of the DS games, this has a great balance of difficulty and doesn't really give you the over powered stuff early, Questing doesn't give that grinding feel, hell, I only had to grind to max out a couple subweapons, otherwise this game is great.
Though Nest of Evil is where the Recycle-fest is recycling bosses from other games shamelessly.
OoE - now my second favorite, but unlike PoR, once you get the Over-powered stuff, you're untouchable.
its okay, but not as amazing as I though it was...
Story
DoS - Tried to be the most story driven of the 3, but lacks in fleshing out the characters in parts.
PoR - Starting on a fumble this game actually tells the story really well, the characters are pretty fleshed out.
OoE - Still tops in story, characters are fully fleshed out and the ending this hits the right key.
What's better in the 3ds mode?
well, the 3ds gives the true-motion effect to the DS games making the framerates oh so great!
Plus the smoothed upscale is great as it leaves the original quality of the games but takes away the jagged edges and things like that.