The avataras of Sriman Narayana are countless. Of these, in the Rama and Krishna avataras, the Lord has incorporated all the aspects of the Sastras. With due regards to the article 'Sri Rama Krishna Avaratharangal' by Sri Narasimhachar in the Magazine "Tattvavada", the same is reproduced below:

The avataras of Sriman Narayana are countless.  Of these, in the Rama and Krishna avataras, the Lord has incorporated all the aspects of the Sastras. With due regards to the article 'Sri Rama Krishna Avaratharangal' by Sri Narasimhachar in the Magazine "Tattvavada", the same is reproduced below:

	Avataram	Sri Rama	Sri Krishna
1	Yugam	Dretha Yugam	Twapara Yugam
2	Vamsam	Surya Vamsam	Chandra Vamsam
3	Birth Ayanam	Utharayanam	Dhakshinayanam
4	Birth Month	Chaitra Masam - Hot Season	Shravana Masam - Rainy Season
5	Birth Thithi	Sukla Paksham - Navami	Krushna Paksham - Astami
6	Period of pregnancy	Born during 12th month of pregnancy	Ninth Month
7	Birth Time	Mid of the Day	Mid of the night
8	Birth Place	Palace	Prison
9	First Darshan	His Mother - Kousalya	His Father - Vasudeva
10	Birth Celebration	People celebrated with Feast	Upavasam
11	Ruling Nature	Boopalan	Gopalan
12	Varnam	Kshatrian	Yadhavan
13	Status of Godliness	Declared that he was always a Man	Through Bhagavat Gita, declared himself as the Paramatma
14	Punishing Mistakes	Declared that he will forgive any number of mistakes	Did not hesitate to punish the Shishubala when he crossed the permitted number of insults
15	Marriage	Won Sita's hand by particpating in Swayamvara	As soon as he saw Rukmini, he married her without getting consent from his parents
16	Valour	Underwent Gurukula under Sage Vashishta and showed his strength only after the age of 15.	Before attaining the age of 15, he killed starting from Bhoothani upto Kamsa and then underwent Gurukula under Santheepani rishi.
17	No. of wives	One	16, 108 wives
18	Leelas done as a boy	No	Yes
19	Searching for partner	Rama (Man) searched for Seetha (Woman) when She was napped by Ravana	Gopikas (Women) searched for Krishna (Man) when He disappeared
20	Surya's Son	Sugriva - His friend	Karna - His Enemy
21	Indra's Son	Vaali - His Enemy	Arjuna - His Friend
22	Adhi Shesha	Lakshmana - His younger brother	Bala Rama - His Elder Brother
23	Moksha	He went to Vaikunta alongwith His relatives.	He sent His relatives first and then He went to Vaikunta
No Changes
24	Vayu's Son	Hanuman Worshipped.	Bhima Worshipped.
25	First Killing	Thataki - a Woman	Bhoothani - a Woman