X738 3pt PTO Brush Hog

Now I would say get the 3point if Your Going to Get a rear PTO
I don't really recommend PTO drawn attachments On the super Garden tractors as you are more Likely to Jack knife . With the 3point You Have more control over the Height of cut and if You get Into a tight area You may not have enough room to turn around it Can be a PIA to deal with the shaft for Making turns as well. Where a Larger turn radius On a sub compact or compact would be better clearance The 5 foot I was Talking about was a 3point Hitch Mount on a X585 But realized Now it was a 4 ft on a X748 By another Member here! I have never run anything bigger then a 4 ft on a X495(older version of a X750) or X465( Air cooled version of a X730)
Here is that other Member running a 4 ft 403 on a X748 and here is another Members son running a 3 point Mount on a X485

If you don't already have the PTO installed, you might want to check out the price. Also check out how easy/hard it is to install. There are some threads on it here. Some people have had some difficulty installing the PTO kit on an older tractor. The 3PH is also a longish install.

My neighbor has a 42" rotary cutter. He has an older L size Kubota. I tried it on my B2620. It handled it okay, but it felt really big and heavy back there. You will definitely need serious front weights and/or a loader to even it out.

How big an area are you planning on mowing and how often?
What is in the area, is it pasture with just grass or do you have lots of brush or trees you are trying to remove.

People do use the X700 series tractors with a 4' rotary cutter, but I would not want to do that for long.

The PTO and 3PH cost about $1,700 + shipping + install + tax. The rotary cutter costs at least $1K unless you can find a deal on a used one. This:
Swisher 44'' Rough Cut Trailcutter Mower | Cabela's
is $2500 + shipping + tax

The PTO/3PH rotary cutter will tend to hold its value well, especially it you take care of it. The PTO and 3PH will make your X738 more attractive to potential users, but I would say that would be in the $500-$1000 range depending on the condition of the tractor. If you plan on keeping the X738 for many more years and you expect to get a lot of use out of the 3PH and PTO, you should get them. If it is just for the rotary cutter, I would think at least three times about it.

I meant mowing with a rotary cutter. They are huge. Not a problem on a wide open field, but is for parts of my property.

I don't have an X700 series machine, but I want want as a "baby tractor". Most people here dream of a 1 series. I like the 1 series, but it is only a little bit smaller and nimble than my B2620 (which is a baby tractor to people in the CUT and "real" tractor forums). It all comes down to the tasks you need to do and the frequency. There is no one machine that can do everything well. But, there is a lot of overlap. Many people mow with a B2620 or larger machine. I would hate doing that. Many people move giant (for its size) logs with a grapple on their X700 series sized machines. I have a grapple and forks for my B2620. It was too small for much of the 60-80' tree that fell down in the past storm. But, it could carry 6 to 8 foot long chunks of it okay. I want an X739 and grapple for small stuff, brush and branches. I want the AWS for its agility. The non-AWS do turn tighter than my B2620, but only by a couple of feet in outside turning circle. The AWS models turn tighter (in outside turning circle) by about 3 feet than the 2WS ones. So that ends up being 5 or 6 feet less space needed to turn around. Not an issue if you have a wide open pasture. Very handy when you are in a narrow place and can't do an N-point turn.

The X700 series has an aluminum case and a single speed transaxle. The 1 series is two speed. The B2620 is cast iron and three speeds. It can generate/provide a LOT of torque, much more than the tires/ground interface can handle in many cases.

Most people would want to have a bigger machine to use a rotary cutter, but some people have tried using an X700 series AWD machine with it and liked it. If you are using it once or twice a year for a few hours, I am sure it would be fine. If your need is several hours a week for much of the year, it might make sense to get a bigger tractor.