Hi Hemanshu -
Good time of year for waterfalls. The snow has a long way to go to finish melting up above the Lauterbrunnen Valley. Up at 2000 meters, it is the tail end of winter and hiking trails generally will still be blocked by snow. Good thing that you are not hikers. ;-) Although the valley floor will likley be free of snow and quite pleasant by late May. Much lower altiyude...about 800 meters.
Although, at the altitude of Luzern and the other major cities, typicaly more like 400 meters, Spring will be well advanced.
If you come back a month later, you could take this easy spectacular stroll. ;-)
The Lauterbrunnen Valley falls are visible along the bus/ walking route from Lauterbrunnen to Stechelberg in many places. And, you can go up to Schilthorn from Stechelberg. So, you can walk and ride as you wish if you choose that route.. The bus ride takes 18-19 minutes and makes 9 or 10 stops, including one at Trümmelbach Falls That one requires an bit of an excursion. You can go inside and get wet. Or, wear raingear. ;-)
Trümmelbach opens in April.
Staubach Falls are quite close to Lauterbrunnen. Less than a kilometer away.
<<"so if I want to see Rhine falls (which will be different experience as I haven't seen a fall yet)">>
That statement poses a dilemma for me. There is a wide range of opinions about the Rhine Falls on this forum. If you truly have never seen a waterfall, then the Rhine Falls in the Spring, with heavy water flow, may well be worth the trip The dilemma is that the Rhine Falls failed to impress us when we visited. However, I have seen Niagara Falls in Canada, and the USA, which are much more impressive. So my usual comment is "If you have seen other waterfall, then perhaps you should look for something that Switzerland does particularly well- like the Alps."
Others have been more impressed than I, and occasionallly I have been accused ofbeing too negative about the Rhine Falls.
Still, I personally would find something else.
Not sure if it would appeal, but if you have any interest in Swiss history, you might like Schwyz. Off the beaten track, for sure.
Where else will you be in Switzerland?