If you're on a budget and you have access to a B450 chipset, then that's what you go for, just make sure it's advertised to support Ryzen 3000 series processor on the motherboard box. If the cost of a B450 chipset board and a B550 chipset board are the same, then you go for the B550, without any questions.
If you can then please Suggest some other motherboard that can be better fit for R5 3600
We will need to know a couple of things;
1| What else would you pairing with the board, apart from the processor?
2| We might not be located where you are, which is why you'll have to state where you're located.
3| What is your budget/currency for the board's purchase?
4| Make and model of your case so form factor is taken into account
5| Preferred site for purchase in case you don't have access to Amazon.
Am pairing
1. Currently have A rtx 2060 as of now, will upgrade to a 4000 series card soon, 32gb 3200mhz ram(16x2), 650 corsair cv, asrock b450m steel legend
(All purchased 3y ago)
Reason for motherboard change is : suddenly my PC display disappears after power on/reboots/restart
Cpu fine
Ram fine
Psu fine
Gpu fine
Only thing can cause this, the motherboard
2. Region India
3. 100 -150dollars nearly 8400 to 10000INR
4. Case supports atx matx
5. There are lots of authorized sellers online in my region. More or less same prices.
Btw is the msi b550 gaming plus overkill for r5 3600?