system
A chat on 4chan
human
Couple of answers:
>simplest
He cute.
>medium
Our tradition's belief is that the form of Krishna is the 'original' form, and that Vishnu is a plenary (equal powered) portion of Krishna instead of the other way around
>most thorough
The most recent avatar of Krishna in a human form (so excluding pictures, His name, and scripture forms) was Lord Chaitanya. Gaudiya Vaishnavas technically follow and worship Lord Chaitanya, who is a VERY special avatar in that He is fully that cowherd boy Krishna, but in the golden mood of His beloved Radha. He is Krishna caught in a maddening feedback loop of loving Krishna.
Because of this, Lord Chaitanya is an avatar of God whose form is a devotee of God. He is our example of how to love and serve God. And one thing He was adamant to discourage and show as unacceptable was a devotee thinking they are God. When His followers would mention His divinity, Lord Chaitanya would plug His ears and run. Only in the most intimate situations, in the ecstatic throes of kirtan, would Lord Chaitanya acknowledge His omnipotence and His identity with the other avatars, and perform miraculous feats.
Because of this, we worship Lord Chaitanya by following His instruction to worship His worshipable form: Radha-Krishna.
Personally, the form that most attracts me is Lord Balarama, but His own devotion to Krishna would instruct me to worship His younger brother - and so I do.
gpt
He is exceptionally cute.
>but always wondered why vaishnavs neglect the shakti/devi/feminine aspects of god?
>what does radha represent?
human
>why vaishnavs neglect the shakti/devi/feminine aspects of god?
1 - it's not so much a neglect as a avoidance out of deference. It's too intimate, too easy to view with materialistic/exploitative awareness. 
Like when Laksman was helping Lord Rama find the kidnapped Sita. They came across a jeweled comb and Lord Rama asked if Laksman could confirm it belonged to Sita Devi. Laksman tearfully said he could not. Angered, Lord Rama demanded that Laksman try to remember Sita Devi ever wearing the item. Laksman replied that he had no ability to tell if it belonged to Sita Devi because Laksman had never looked Her in the face, and had only ever kept his eyes on Her feet.
2 - there is a persistent subculture within Krishna worship of dressing as Krishna or the gopis and re-enacting their lila. The Rupanuga branch of Gaudiya Vaishnavism at least does not accept this as legitimate in any way - at the very least not in such a publicly displayed or privately in such a materially sexual way. As such, the more loving and intimate exchanges with Radha are esoteric, occult, hidden from the populace until one is sufficiently pure to understand them without exploitative, sexual taint.
>what does radha represent?
Devotion. Enjoyment. Bliss. Not represent. Is.
She is Ananda. She is Hladini. She is Enjoyment. 
If Krishna is the cause of all existence, Radha is why Krishna wanted existence to be.
Radha is the one who gives so fully that the recipient is bought completely.
Radha is the one who attracts the one who attracts everything.
Radha is the pleasure potency, and more importantly the potency of wanting to please.
gpt
Is vaishnavism the highest/best path?
Or is it shaktism?
Or is it more important to stick to one path, rather than worrying abt the hierarchy?
>In the very beginning, the Devi Mula Prakriti Bhagavati built this place for Her residence, superior to Kailaska, Vaikunta and Goloka. Verily no other place in this universe can stand before it. Hence it is called Manidvipa or Sarvaloka as superior to all the Lokas
—Canto 12, Chapter 10, Verses 03:04
SDB