>> So my question is what is the best tool will be used for this purpose, like sapinst, DMO, expdp/impdp etc
SAPINST is outdated and is replaced with SWPM. Kindly use the latest SWPM tool available in SMP. Refer System Copy guides for the same.
>> Can you please let me know whether NZDT (non Zero Downtime Option) covers in SWPM
nZDM option is only available in SUM Tool.
regards,
pavan