which Chilton repair manual should I buy?
 

...for my 91 s10 4x4 blazer?
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Neither they are only good for telling you how to change oil or maybe jack the truck up. Best advice I can give is hold out until you find a GM service manual specific to your year and make and buy that. It will be more money but more than worth it.
Like this one! Thanks for the pic Gio hope you don't mind me stealing it from you!
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They are the same, the 82-91 was printed in 90 or 91 and the 82-93 was printed in 92 or 93. The newest reads 82-94. I'd say get the cheaper one of the two in best shape.

A chiltons does way more than tell you how to jack the truck up. Other poster talking about a haynes and they aint worth crap, better than nothing tho. I do agree the factory manuals is best. I lucked out and found the complete 4 part manual for my 87 on ebay for $20. They have everything from frame specs to complete wirig diagrams. That factory manual above is the one gm sold to the public and they used to be printed by chiltons.

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I have one of the above and a chiltons for my nova and they are just about word for word the same book.

Your right they do tell you more than that! I really meant that in a sarcastic way. I just hear all kinds of stories about them with inccorect or misleading info and they are just a basic overview more for routine maintence sort of stuff as far as I am concerned. Neo you are correct tho they are better than nothing but I would still hold out to find the complete manual if possible! I actually just finshed priting off several hundred pages of manuals that I am going to put into a binder to keep on hand and they have pretty much every bit of info I could every need about my truck:)

For the blazer I think the chilton is a good enough manual for the do-it-yourselfer. I've referred to mine numerous times and always found the information sufficient and correct (to my knowledge). With that being said, while working on another vehicle I had a haynes manual at my disposal and found the information slightly more detailed and easier to work through. It seems to me that the chilton manuals vary from vehicle to vehicle (maybe something to do with the manufacturer?) by what information is provided and what's not.
I was recently working on a 89 ford tempo and was trying to diagnose an ignition problem (no spark). The owner had a chitlon manual, which I used to go about troubleshooting the problem. I found that one of the schematics was off by a year and the test procedure/results for the ignition module circuitry was incorrect. Took the ignition module to autozone to have tested and found it was faulty. I must say the information in that particular chilton manual led me astray and in to the woods. Just my 2 cents...

Chiltons is owned by haynes now. Been that way for some time so if one is off the other is. More often the haynes manual is cheaper and their solution is remove part, replace part with very poor pics. Chiltons goes into a bit more detail. Haynes is free on autozone.com, all you have to do is enter in the trucks info. Why I would never waste money on one of those.

By the 90s just about every dealership had computers. The service guys printed off the info they needed. The paper manuals from that time frame labeled factory manuals were sitting on a shelf in the parts room to be sold. All in all they just a fancier version of a chiltions the dealer got their markup on. They are a bit more year specific but I wouldn't pay too much more than a normal chiltons. I've seen then go for $50 to $100 on ebay and just not worth that. I gave $20 shipped for the 4 books I have. The dealer sold chiltons I might give up to $40 on but not any more.