@Alex **********
The main airports as Suvarnabhumi and Don Muang are known to be more strict. Phuket and Chang Mai are more easy.
Can’t give you a accurate answer, but based on other skilled peoples knowledge (Tod Daniels) and general feedbacks over a period of time there’s almost no reports of tourists visas turned down by a land border (unless you use the (crazy) strict Poipet border to Cambodia). People who got turned down with a tourist visa at the airport and have managed to fly to a nearby country have entered by a land border with the same visa without any issues.
But I agree with other people commenting, since you’ve been home for 3 months and not are going back to back my bet are that you’ll be fine even at an airport, but just mention it as you know the options.