Regular/standard model vs Ratigan model.
Basically they are the same rest.
Mechanically, the main differences are just the uplift springs and counterweight.
The 'regular' rest can be converted to Ratigan version every easily. (You only need to remove the uplift springs inside and add a counterweight designed for the weight of your rifle).
The Ratigan version can be converted to regular rest very easily, too. (You only need to add uplift springs and not use the provided counterweight)
They can be interchanged to each other within three minutes or so.
You can use (or add) a counterweight to a regular NEO only for heavier gun, say over than 30 lbs.
You would only mess with your regular NEO if you add a counterweight for an F-Open rifle. It is NOT needed, the joystick action would NOT be best too!
Based on my experience shooting Benchrest and F-Class comps in several countries as well, I also found/seen that some people prefer the joystick action to be firm / more firm (not light), some prefer to be light or as light as possible. The good thing is, the tension setting on your NEO rest is very easy to adjust, only by two thumb screws, no tool is needed. I had many users happy after I tuned/re-tuned their rests in the range.
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Re; counterweight
Paul Schmid (our first USA dealer, RIP) & I invented balance weight system (we called it "BWS") last 2004/2005 when we modified an old/original SEB rest for a heavy gun named "The Fist of God". I forgot with the weight of the rifle but it should be over than 40 lbs. We (only) put a weight on the front side, secured into the 'front' center shaft, to counter-balance the weight of the gun on the rest top. The owner let me shot the gun & rest combo for the first time. I shot probably 10 rounds and found the combo work just fine. I was able to move the joystick with light effort, just like the regular one. It was the first joystick rest with a counterweight, I believe.
Mike Ratigan's counterweight is originally designed for 10.5 - 13.5 lbs LV/HV gun. For heavier rifle you may need heavier weight.
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So now the question is, which one better?
My answer is: BOTH WORK, and work fine.
Anyone can also win any shooting matches with both models if he/she is capable to win....no matter is it with the 1pc bag or the 3pc bag config, etc.
With proper-calibrated counterweight, you actually have about 10% smoother joystick action. (But majority of the NEO users don't know the difference if Mike or I don't explain this or the why). The "cons" is you need one more item (the c/weight) to bring around.
With the regular NEO, which is already the SMOOTHEST in the market, you can use the rest "as is". It works for rifle from "zero" up to +/- 30 lbs.
Summary;
I can say it's more about USER'S PREFERENCE.
Find what/which one works better for you.
Hope this help,
seb.