PTO Generator/welder or Hobart?

I can weld remotely but it's a 6500 watt generator and a small 220v mig.  I'd rather stick, especially outside in the wind.

I have four 'portable' welder-generators, I use NONE of them for backup power, because I've got a generator shed with generators specifically for that purpose. 

One portable is on a specially-made pallet that holds welding rods, gloves, shields, 4" grinder, a fire extinguisher, water sprayer, oxyacetylene torch rig, and floodlights... USUALLY it's sitting inside the shop door, and if I need to move it around the shop with a pallet jack,  it easy.  If I need it in the driveway, I pick and carry it with the Hyster H50H.  If I need to go out into a field, or somewhere else of questionable terrain, I put forklift attachment on the D17 and drop a pin through the forks, so it cannot slide off... and away I go.  If I need to go further, I can fork it onto a trailer, or a pickup truck.

I have a 4cyl 10kw gasoline welder/generator mounted on the bed of my loader-crane truck.  It doesn't power the crane's hydraulics (but I've considered it), but if I want to reach out and use the hoisting drum, the boom lighting, or some power tool, it works great for that.  If I need to reach out and weld something, I use the crane boom to support the welding cables, rather than having to tie them off somewhere to keep from pulling me away from the work.

My trailer-mounted unit is a Miller Bobcat, it will do CC and CV, I have a wire feeder and a gas bottle rack, along with stick leads.  I don't have a scratch-start TIG torch on it (yet)...

The smallest welder-generator is a V-twin Honda powered machine that is hard-pressed to melt a medium 7018 rod... so just keep it to a minimum.

PTO generators are handy when you've got a farm emergency (like a poultry building that lost power to ventilators)... but for emergency power in an outage, I wouldn't do that, on account that a tractor running the PTO is incredibly fuel-inefficient... and you'll be carrying fuel cans for anything more than a few hours.

My backup generators (there's 4) are all fed propane from a pair of 1000 gal tanks... I pick my generator SIZE based on anticipated load.  Under very light loads, I'll be running a 2kw Onan.  Add more (like cooking with microwave, or frequent sump pump cycling during rain) I'll start the 4kw Kohler 4cyl.  I can bring up a 6.5kw four cylinder to get a little more 'headroom' (like microwave oven, dishwasher, air conditioner)... or if we really need it (i.e., baking, clothes dryer, running my machine tools, welding, etc) , I'll start the big six-cylinder Kato and run the whole danged farm... but running a really big engine for a very light electrical load is a significant waste of fuel...