ok I feel your pain and I think I have finally worked it out
1. The take and Play is a set unto itself designed for traveling. it packes up into little carry boxes that fold out into a set. the good thing about them is that if you want to collect the entire set of engines i think this one covers it and the trains are cheep. **It has the die cast trains which can also be pushed along on the trackmaster tracks (one wheel on the outside one inthe middle) (I have seen some wooden tracks that have a roadway on the other side which you could use the take and play on)
2. The trackmaster are primarily for battery and remote control trains - big bucks and you only get a few engines you can buy - not a huge range in australia BUT they do work on wooden tracks.
**we got given one and we converted the coupling system to have a magnet!! now it pulls all the other ones
3. Wooden has the most available to you in terms of extras and it fits with IKEA stuff too. NOTE if you wanted a battery operated train like the trackmaster you can!!!!! there is a thomas that has a push button on his back instead of the trackmaster flick switch and a magnet coupling system
Conclusion they have you by the short and curlies especially now they have MEGA BLOCKS Thomas too!!!!!!!!!!!!!!!!!!!
My solution was to buy the take and play cause its cheep and easy and great if you need to buy a $3 toy for a bribe!!!! and let the relatives buy the other stuff. they normally come in their own little world so can be enjoyed on their own.
Hope that helps