The bigger alternator makes more amps at low RPMs. That's the main reason why many new autos come with 150 amp alternators. It's not to make 150 amps. It's to make 50 amps at engine idle speed so when stopped at a traffic light or stop sign - and the AC and stereo and headlights are on (and other loads) -the thing keeps charging.
Farm tractors often have different pulley ratios then cars and the alternators often run slower. So a tractor with a lot of electrical loads can benefit a lot from a larger alternator. All depends on what you want to do. We had a Deere tractor with a 37 amp alternator at the shop. The farmer was trying to run a 8 row corn planter with it and each row drew 7 amps of power. I.e. 56 amps all the time. We had to stick a Leece-Neville 160 amp alternator on for him.
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Today's Featured Article - Oliver 550 Purchaser Checklist - by Greg Sheppard. Pound for pound the 550 is better than anything I've seen. It has great power for its size and can really hunker down and lug. Classified as a 3-bottom plow depending on soil conditions. I personally don't think it can be beat for a utility tractor in the 40 HP range. They are extremely thrifty on fuel, at least my DSL is. Most drive train parts are fairly easy to get. Sheet metal is probably the hardest thing to
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