My favourite monster type mob are blazes, a friend taught me a trick to do with snowballs which can be used to kill them, when snowballs are pretty much useless against anything else damage wise. But I liked farming blaze rods in some of my older worlds in the nether, will be doing it again in 2 of my current ones when I get around to it. Such an efficient power source that lasts a long time in furnaces, too bad mine cart with furnaces no longer exist in bedrock edition tho.
My least favourite are Creepers, even with blast protection on armour which allows you to avoid being insta killed by surprise from them, they still destroy builds in addition to the terrain damage and resource waste because they leave craters with their explosions and they delete blocks from the world. Had it not been for the wondering traders offering dirt in trades, that resource would've been finite in supply per world and it is underrated as a resource because it allows you to get food without having to kill any animals.
But you can prevent their spawn with lighting.
it's not even being killed by Creepers that annoys me, when friends are on the server I have to remind them to fill in the holes left by them after they've been fighting them.
My least favorite minecraft mob is the fox, now foxes will pick up what you drop, i had one time had a sword with shapness V unbreaking III fire aspect II and mending, it was out of netherite, i had just finished my god tier armour and tools, but i accidently pressed Q in front of a fox when meaning to press w to walk foward to a tree to cut down, but the fox picked up my sword, i pulled out my axe so i kill it, but it would run, i would try shooting it with bow but it would move too fast later my crossbow with multishot, still kept missing, so i shot my fireworks with the crossbow and finnally killed the fox.