MG Chemicals because its local and a store near me (Sayal) sells their stuff. But the store people are clueless about what they sell. Its the only electronics store near by and they carry plenty of the stock so I rather deal with them.
if you have experience with MG Chemicals line of products tell me what to buy to make PCBs. Traces on both sides, components on one side, no multilayer, whats that board called? Forgot as I graduated from EET decades ago, made PCBs in the lab but don't remember the process details.
If there is a kit includes everything needed to fabricate the PCBs tell me about that, I rather start with that than with a long list of stuff and forget to get something.