Hantek is a recognized name and here is a review on the 5102B.
https://www.circuitspecialists.com/blog/product-review-hantek-dso5102b-100mhz-digital-storage-oscilloscope/I wonder why they used steps of 2,4,8 instead of 1,2,5 like most other scopes. I have a problem with 8 uS per division - I can't get to frequency as easily as if it were 5 uS or 10 uS. Binary multiple are great for some things, not so great for mental math.
I can't find out too much about the Scientech but the Hantek has some math functions likd FFT, *+- etc, It may also turn out that the Hantek has more triggering modes but at first glance I can't be certain.
Of the two, I would pick the Hantek.
You have a price limit, search around YOUR country for scopes in that range. You have already found two, perhaps there are more. Then search for reviews. It may be difficult to get a specific recommendation for a scope in India.