SMIC has down to 65nm CMOS process which was told that TSMC compactible(I don't believe it).
SMIC is much cheaper compared to TSMC(2~3X) but very few IPs available. Some IP venders in Shanghai work with them but as I know, the quality is not well recognized.
TSMC is the No. 1 and about 50% market shared. UMC is beaten to 3rd and while Charter is coming to 2nd. All of this three have lots of IPs available for free.