For specifics read the specifications information's ? of each meter and do comparison's ??
Without being rude, That's what we call doing your homework
And asking for specifics in what ? your question(s) are to vague ... Rishab brand meter are not known here
Usage 300,000 count meter with good fuse protection, good dial feeling while turning it.
Performance slow reading / display refresh
Calibrations ? if like Gossen = expensive
Accessories ?
As written on your other thread, this meter brand is a copy of the Gossen Metrahit 28, minus some functions removed, Proprietary of Gossen ...
Luckily theses meters are still sold today it seems, try to ask them if they have spare parts, case parts ... Like many brands, they use a dedicated ASIC.
Worth to buy mmmmmmm not so sure, you will pay a lot for the accessories like the usb to ir module, rs232 to ir module
Not to brag I have a 28 and 29s but as i wrote on other thread, they are peculiar high end meters ... and you'll pay for that, no service manuals.