You've summoned me from my headphone-nerd-cave. It depends on what you're trying to pay for, and what type of headphones you desire.
First off, we should establish two terms. Noise Isolation vs Active Noise Cancelling (ANC). Noise Isolation is the ability of a headphone to (passively) block surrounding noise by cutting off the vibrations around the ear. ANC is when a headphone uses a built-in microphone to detect surrounding noise, and actively produces a "negative" of that noise to "cancel" it out, attempting to achieve even better noise isolation.
Depending on your preferences and fit, some of the best total noise isolation results are achieved by in-ear headphones WITHOUT active noise cancellation. Check out
this graph for instance, in which Shure SE215s (an in-ear headphone without ANC) isolate sound similarly to the Sony WH-1000XM4 across low and mid-bass, and perform better in the mids and low-treble ranges (perfect if you're trying to not hear your coworkers talk).
Speaking more specifically of Bose, they've long been an overpriced range that sold basically for their ANC. The actual sound quality of their headphones didn't live up to their price tags, but they were miles ahead of the competition in terms of the quality of their ANC. In recent years other companies, like Sony and Sennheiser, have made great strides in terms of catching up in the ANC market, if that's specifically what you're looking for, so there's alternatives (some of which are cheaper and/or better). But if you're just looking to block out sound, and don't care about doing so via active noise cancellation, a whole plethora of options opens up.
I'm also somewhat of a headphone luddite when it comes to things like active noise cancellation and bluetooth. I would rather put my money into sound quality than extra features. I loathe Apple's decision to remove the 3.5mm jack that pushed the world towards wireless headphones. With a wireless headphone, you now have to end up buying an DAC (or two for "true wireless), an amplifier, a bluetooth receiver, and a battery in addition to the speakers you're putting on your head (and when you've already paid for a DAC and Amp in your device that are now being rendered useless). And the quality and lifespan of those products may vary wildly, and have huge impact on the quality of the sound. I did finally cave and buy a pair of Sennheiser PXC-550II wireless ANCs for airplane use once my 3.5mm phone case/Amp broke for like the 5th time (someone make one of these things that actually lasts). They're alright, but I'd much rather have my choice of wired headphones.