I say like this because I have better result while playing on MT than MT2.
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Overall on average, you would always have better results in Money Train 1 compared with Money Train 2. In the 1st version, you would only need 80x to break even compared with the 2nd one on 100x however it really could pay off if you are lucky though. For me personally I'd rather do Money Train 2 bonus buy instead because Money Train is kinda boring and lame though ( no payer/collector

) . Also dont forget that you get extra 500x if you complete the full reel on Money Train 2
Because of this, make MT2 more extreme than MT1 so can understand why MT1 can give you more good result than MT2
It supposed to be higher though but both are listed as HIGH volatility and Money Train 1 has 96.2% RTP while Money Train 2 has 96.4% RTP