What is the best visa option for returning to Thailand for 3 months after my current Tourist Visa?

The only specific policy on number of entries is VISA-EXEMPT by LAND 2 times per calendar year (by air no limit). Tourist visas no specific policy how many per year, it is at the discretion of the consular office where you apply. The Thai consulate in Vientiane has a user-friendly reputation.

According to official rules you can only visit Thailand twice per year I believe. 2x60 days , single entry. tourist visa (TR) plus 2x30 with the extensions. So about 6 months. BUT written or/and verbal rules are often a big grey area. Or Purple to be precis. It would be incorrect and unfair to claim anything for certain. It can be a problem but most probably wont be. Only way to know fore sure is to try. I mean a lot of people have been here for a LONG time just on tourist visas alone. If there is a problem it still doesn't necessarily mean you wont be allowed to enter in the end. "Just" hassle, Not sure how it works in France. But usually, but not always, you need/have a return ticket as well or one that confirms that you will/can leave the country withing 90 days. Otherwise they wont even give you the fancy sticker in your passport. AKA visa.