Hi. I don't think either are trending. I believe it's more a matter of taste and lifestyle. Glass tops are a bit more high maintenance as you see smudges much more easily.

If the shower area is sufficiently big, I would prefer to opt for glass partition as that ensures that outside dry area does not get wet, which may happen in case of shower curtain. Having said that, I would opt for shower curtain if the shower area is small to avoid accidentally banging my elbow against the glass partition while taking shower and getting hurt.

Glass railing is in fashion nowadays. Its a modern design concept and wide used in designing home.

the pictures you see online of glass walls and roofs are those not from India. and the usually have a large property and the home itself is secluded enough to provide privacy. for heat, they have a centrally controlled HVAC system that is on 24x7 to regulate heat and cold, plus the glass is often reflective and double, to provide a modicum of insulation. since you're a resident of Hyderabad, it would be more advisable to have just a skylight or just large french doors and not got for the entire combination. hope this helps