when you mean 2-3 pulls, do you mean getting enough stones for 2-3 rares? (Still a total noob). I gotten hooked on this and am playing simultaneously on my ipad and galaxy nexus.
On my Nexus I'm Rank 17 with
Angel,
Plesios,
Vampire,
Harpie Devil,
Sharda,
Lil' Blue Dragon and
Flame Golem as my rarest monsters. On the iPad I'm Rank 25 with
Vampire Lord,
Tyrannos,
Super King Gold Dragon ,
Green Dragon,
Pyro Devil, and
Drall as my rarest.
Are either of these two accounts worth spending more time on or should I just reroll for those monsters listed in the OP?
I'd probably reroll if I were you. If you're planning on playing the game for awhile, then it helps to have a good, strong unit that can form the foundation for a powerful team. In general, you'll be looking for a God / Goddess that offers bonuses to like-colored or specific type of unit.
Vampire IS a solid card and most of the members of a dark team are fairly easy to assemble (meaning that you can get almost all of the units without spending any money.) The problem is that, while rare, he does drop from the free card machine. What you want is something that you can only get via the rare machine - something good.
I had to start over once when I sent my phone in for repairs. The first time I played, my first pull was a Genie - a pretty mediocre unit that I almost never used. My second pull was a green golem. Both are pretty bad, but I was still able to advance past the Castle of Satan and was slowly amassing a decent collection.
When I started over, I pulled Chiyome and my second pull was a Highlander. They have great synergy and she's been great to me - the only problem being that no one else uses her. :/
Long story short, if you're having fun, you don't really need to reroll. You'll hit the wall sooner than later and then progress will slow to a crawl. Pretty much everyone but the heavy spenders hit that wall at some point though.
If you're not attached to your units, take a look at the wiki and get an idea of what kind of monsters you like. Maybe make a list of potential candidates. Then if one drops, you'll be good to go.
Popular candidates are cards like Valkyrie, Isis, Green Odin, Parvarti, Ookami Ameterasu, some of the newer Roman gods, Shiva, and Orochi. These units are popular usually because they're either highly in demand, or keystones to entire team set-ups.
Good luck!