Money train 2 is an extremely volatile slot and even if you get into the bonusround you can still have bad luck and only win x10. On youtube, I have seen massive wins on money train 2 but in 1 video, acomparison between money train 1 and 2 was made and that guy won more on money train 1 (after 10 feature buys on both slots).
Its because Money Train 2 has higher volatility compared with the 1st version. It also means the number of players getting shitty bonus buy will be higher as well so no doubt that the comparison video ended up favoring the 1st version but 10 is a small sample subject to compare both of it.
I personally stick with Money Train 2, it is alot more entertaining especially with the payeer/collector and necromancer symbol , also you will get extra 500x multiplier if you manage to fill all the slots but its pretty rare to happen .
@cmonman : Great hit, I never pass 300x yet with Money Train 2 lol