Which is better for the future: PEC civil or UIET Chandigarh CS?

The choice must be done purely based on your interest. If you are not that interested in coding and if you take a lot of time to understand the core language, there is no point in opting CS even if it's in high demand. Once you enjoy what you are learning you will succeed in your job position. Otherwise, there is no point in being hung up in a course which you don't enjoy and for four years or even for the rest of your life. 

Quick stats 2021:

If you don't have a specific preference and you are okay with either CS or civil, then clearly assess college reputation, placement stats, and other opportunities in the respective fields which are briefed out below. 

• Both PEC Chandigarh and UIET offer 24/7 high-speed internet facilities at both academic blocks and hostels. Academic blocks are fully air-conditioned. 
• Labs are fully equipped with hi-tech equipment. Libraries are up-to-date with new books of international standards. 
• Food at hostels is pretty good and you can even opt for off-campus housing facilities. Both of these universities give priority to sports. 
• Both of them organize certain tech fests out of which 'PECfest' of PEC and 'Avishkar' of UIET are quite popular.

As a branch CSE is on top when compared to Civil. But when you compare PEC and UIET, PEC has an upper hand. Set your priorities straight and opt for the best college for you.