If you want prepaid, it is all depend on your usage. What is your priority? call?SMS? or data?
For Celcom Prepaid, there are new Celcom IOX , which gives FREE 10 seconds with every call, 10 free games (useless) , and 3 x 10 minutes free Internet EVERY DAY
To get 4G/LTE, you need to subscribe to any mobile Internet as low as RM5/month (or no time limit at all)
As for 4G/LTE coverage,Celcom is awesome and good. For the speed, from my experience Celcom is better.
For Hotlink, the plan itself is awesome(free Internet as long as you top up, 64kbps only, enough for Whatsapp/Telegram, etc)
but if want 4G/LTE , need to subscribe to their mobile internet as low as RM30/month (got cheaper package for daily and weekly)
Its all depend on your usage.
My priority is Data mostly. I live in Singapore and have a Singapore line, so I only need a prepaid line for when I'm in Johor in the weekends visiting my mum. Her house has no internet anymore (she only cares about her Astro), so I tend to use a lot of data when I'm staying overnight for Youtube or iTunes movies and whatnot. Social networking apps aren't important to me. I'm still an old-fashioned e-mail/BBS kinda guy. I was thinking of the Celcom 2 GB or 4GB plans (without auto-renew), depending on my stay.