Should I do a visa run or extend my visa in Ranong?

Hi guys, happy new year , this is probably a very easy one so I hope I’m not wasting your time , I’m traveling around with my Thai girlfriend, was going to Ranong and extend my 30 day visa issued at survanabhumi airport , issued reluctantly by immigration as , I think, it was my 3rd visit to Thailand in 2018 , we’d also done a land crossing into Vientiane and a land crossing back in Thai from Cambodia , all other trips were internal flights,oh and 1 visa extension in Pattaya! ( interesting) . My questions are , should I do a visa run ( my first ) . Or extend visa at Ranong immigration , and not risk refusal and abandonment of said lady in Ranong , . Have a Uk passport , will cross with 10000 baht and 300£ English, photos and will get hotel in Ranong , so an address ( or use Dee’s in Khon-Kaen) oh have brand new 10$ note , I’m really asking because reading posts here the last few days getting concerned about re entry after multiple visits and the reaction from lady at airport on my 3rd entry , cheers , Rob