Look 18T5 is best AC hands down.
Even gree fairy is offering T3 compressor, not fully full 5 DC. In 2016 they had Gree Viola series, which was the best with 4.0 EER, highest I have seen.
5 DC means
Compressor, expansion valve, outdoor fan motor, indoor fan motor and indoor vane motor all are DC
TCL after sales is good. No worries there.