10 years compressor warranty is very good and since he is giving you the option for replacing it, then i don't see any problem in buying PEL, because its a good & established local brand. Plus i think it'll be cheaper than Gree.
so i researched more and found one shop who actually knows my uncle so he recommended me gree 1.5ton and in 2nd no he recommend gree lomo series which he says comes to 4 amps, than he said get pel 1.5ton with 10 year compresser warranty, its amps goes down to like 3amp and even more if we use it contineously. so i m thinking of going for pel, as he is a reliable guy and said if cooling performance are not good of pel he will replace it. he also placed kenwood and haier as a 5th and 6th option