first of all, no these games are not easier. They are still rather difficult.
2nd, if you are only interested in Pink Sweets, then that game sucks. Not becoz it is bad, but becoz MMP is IMO a much better game so per your perspective PS would not interest you.
anyways, these games are both very fun and addicting!! If you have played other Cave games, these games play absolutely nothing like them!!
the reason is they were made by Shinobu Yagawa of Raizing/Battle Garegga fame and not the usual Cave people. Note I do not know who the usual Cave ppl are nor have I ever played Battle Garegga

lol
for starters, the enemy and bullet patterns arent typical Cave so off the bat the games feel different. Second there is no counter management, nor ship speed differences when using different shots, so the scoring systems are very different as well.
The scoring in both games is actually very simple, however the better you perform the higher your rank goes up making the game much more difficult. The depth of the games comes from controlling your rank while trying to maximize your score.
EOJ's review is here:
http://www.cave-stg.com/?p=1041
and note the game defaults to version 1.01 unless you choose 1.00 in the options menu. Again, the games are very fun and addicting, regardless of port quality.
and yes the regular edition comes with DLC, but only the first run. Chances are, they're all gone by now.