Brass fittings IMO are pretty unnecessary, the nylon insert fittings work just as well. I have several thousand feet now of 1"-1.5" poly buried. With the 1" pipe, I use cinch clamps which are much cheaper and faster than the hose clamps.
Shop Apollo 1-Pack 1-in - 1-in Dia Stainless Steel Full Clamps at Lowes.com
Tool:
Shop Apollo 1/2-in to 1-in Poly Pinch Clamp Tool at Lowes.com
Note the tool gets horrible reviews. That's because people purchased it for installing cinch clamps on PEX, which are a different style. The "$20 more" tool is for that style of clamp.
One thing I've learned is that once the pipe is in the ground and buried, it's ability to move is a lot less and the joints hold up a LOT better than above-ground ones.
If I had unlimited funds, I would use PEX or thicker wall PE/HDPE pipe with $$$ fittings. Water lines to houses are usually those materials with pack joint fittings and they last
forever. That is the standard for water lines just about everywhere. I think there is some confusion in this thread with the cheap irrigation poly and slip fittings, and the thicker wall pipe that only works with pack joint fittings. I wouldn't run my home water line with this cheap stuff. But, my line runs to many spigots around my fence, in the middle of the back yard (1+ acre of grass) and behind the barn (~1.5 acres), and 500' from the yard to the road so I have access to water basically everywhere, at a very low cost. No underground leaks in several years and I keep adding to it (3 new spigots this year)... the only problems have been unsecured above ground connections.