I have compared the power output of Nissan Sunny versus Honda Civic and Altis. It seems that both civic and Altis are using the latest engine technologies(variable valve timing mechanism)to obtain higher power outputs and better fuel economy where as sunny engine generates far less power and may not be as fuel efficient. The results are as below:
Civic - 1.6L - SOHC 16 valve- VTEC - 128hp
Altis - 1.8L - DOHC 16 valve - VVT-i - 134hp
Sunny - 1.6L - DOHC - 16 valve - 108hp.
Also, historically in Pakistan sunny has had a lower re-sale value compared to honda and toyota.