Here's how I would've done the Pros/Cons of the females in terms of anatomy and experience..

Amy Rose

Pros:

~ Has the largest ass of the females.
~ Mid Experienced
~ Mostly predictable.

Cons:

~ Not much of a bust, but larger than Tikal and Blaze..
~ Doesn't give into other male characters as easily as she would to Sonic... (Unless the character has blue paint..)
~ Likely to reduce your health, and drain "energy" with dates..

Rouge the Bat

Pros:

~ Has the largest bust of the females (Only slightly larger than Aleena..)
~ Obedient, as long as you have a gem, of any kind.. But with an Emerald... Well.. *wink*
~ 2nd Highest experienced

Cons:

~ Will likely go behind your back.
~ Will likely berate you for not being able to satisfy her..

Blaze the Cat

Pros:

~ Will most likely understand your troubles.
~ Well-mannered, and tolerable
~ Mid Experienced (Slightly less so than Amy..)

Cons:

~ Not much bust, but larger than Tikal..
~ Will probably be the man of the relationship.

Cream the Rabbit

Pros:

~ Obedient.
~ Has the shortest orgasm span..
~ Dem EARS!

Cons:

~ Has the smallest bust.. (Well, she is 9..)
~ Will likely snitch on you..
~ Least experienced

Tikal the Echidna

Pros:

~ Easy to start a relationship with..
~ 3rd highest experience..

Cons:

~ Pacifist.
~ Will make you spend every day with her.

Marine the Raccoon

Pros:

~ Adventurous
~ Willing to try new things..
~ Will likely believe anything you say..

Cons:

~ 2nd smallest bust (Behind Cream..)
~ Experience unknown..