MTB or Road Shoes

[Celt]

I am looking at getting some pedals and shoes. Been on flat pedals since I got the bike last year, a Pinnacle road bike. I only use the bike for fun never commute or travel on it.

Looking at youtube videos that suggested getting MTB shoes and pedals even for road bikes as you are able to walk in them without sounding like a tap dancer. Should I be going for MTB pedals? I am only ever going to be using them on a road bike and rarely walking in them, only really going into shops for water when I am out.

Any suggestions for shoes and pedals as well? As cheap as possible ideally! Just finished uni and not overly flush at the minute.