Are 'possibly' ratings taken into consideration? Because if so, I believe Godzilla could win as he has a 'possibly Town level' durability statistic. Thrash Machine has Multi-City Block level AP. Thus Godzilla should be capable of taking numerous attacks from them.
In addition, Godzilla has an AP advantage, and since speed was equalized, it's unlikely they'll be able to avoid Godzilla forever before Godzilla takes them out quite easily with vapor breath. Especially if Godzilla latches onto them considering he has superior lifting strength (Godzilla's scales to 25,267.9 Tons, Thrasher caps at 5700 Tons. That's a pretty large gap). If he latches onto them, it should be over considering at that point, Godzilla could just unload vapor breath onto them.