If Snapdragon vs Exynos debate is essential to you then S10 lite is the only option. If you just need a phone that does everything well and saves you about ₹10k in money, then go for S20 FE. If you want a flagship phone with all the specs and design you can show off and are willing to spend the extra money, buy the S20+.
Many S20+ exynos users have complained of battery life and overheating. Something to keep in mind. That being said, as a S10 lite user I was pleased with the performance of the phone until One UI 2.5, after One UI 2.5 there is a considerable battery drain and no update after it seem to have fixed it. Maybe Samsung might release a fix with One UI 3.0.