The easiest to clean and get at are the break open. Such as you find in the Omega, Optima, Sidekick, Revolution, Pursuit, Kodiak, Beartooth Magnum, Encoreand others. Since they break open, you can see the threads of the breech better which would mean easier to clean. Once you remove the breech plug the barrel should be easy to get at to clean.

Some of the bolt models are great rifles, but the bolt can be a devil to clean, just as the striker action. I personally do not mind the bolts or striker. They just take a little more care is all.

As for the safety issue concerning BPI barrels. Well there are cases of barrel failure in the BPI line. These include CVA, Traditions, New Frontier, Winchester and others. I think even A&H and Remington but I could be in that group, I could bewrong there. Without opening the whole can of worms, if the lack of stringent barrel pressure testing does not bother you, then buy the rifle you like. If you are concerned that some of the barrels are not fully tested to levels considered safe, since many modern loads create more pressure then the present rating of the BPI barrel, then get a Knight, White, Thompson Center, NEF, Savage, and some of the other known brands.. I own a number of the CVA and Tradition rifles. In fact I was shooting one today. 90 grains of Goex 2f and a 302 grain Buffalo Bullet Sabot.. a real sweet shooter.