Best is a tough call.
Any magnetraction steamer really. The quality was great during that era.
The Trainmasters!
GG-1s if your track work is worthy. Those bogies hop on the best of them.
Land, Sea and Air sets.(W/extra loco, launcher engine is very weak)
Freight sets with the gantry crane .
General & W&A passenger cars. THEE Christmas train for me.
Also General freight sets. 
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Not great pullers, but they stay put, and the look is unique. And it had the geared op. gunfighter car & a Fort Knox car 
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The all time best looking & best pullers?
An A-B-B-A all powered with as many passenger cars as you can fit behind it.
If your still bored, bash in two more motors, parallel a couple ZWs,
Still bored? Use that stump puller carbody to remove your layout accessories because you've sort of peaked.
Or trade it in on a Big Boy double header.
