Though Churchill was a better writer, and also his subjects should be of more interest to the general public
1. "Extremes" appeal to people more. As simple as that
2. Indians are more inclined to fascist, authoritarian politics than we assume (I don't buy this)
3. There is an aversion to Churchill (for obvious reasons) that doesn't exist w.r.t. Hitler
We live with the reality of a weak state, and are too familiar with its shortcomings
So there is a craving for a "strong" state/leader who can "get things done"
There's less worry about the downsides of a strong state
On that note a related thread on the Indian fascination with Germany, Japan, USSR