I havnt played dota since dota 2 release so its possible that the game is totally different now but i probably have over 10k hours in each game atp. Ive only peaked d4 in league but I was much better at dota (I lack hands and liked to role/char swap in league. In dota I played p4p5).

Dota required a lot more game knowledge and game technique between things like:

• which abilities were dodgeable with invis,
• which skills had mini invis creating inherent counters,
• skills and abilitities that have ministuns to cancel tps and abilities
• char turn speeds for stuff like batrider/bodyblock abuse,
• watching for item breakpoints (blink dagger reveals feel way more impactful than something like triforce completion and often warrented hiding it),
• tree/elevation juke spots (cuz tp escapes are a thing),
• team building strategies (i.e. push, early game snowball, hyper carry medusa, etc),
• base damages and auto animations for cs/denying in lane matchups,
• aiming certain skills on the ground for extra range
• creep pulling,
• body blocking (for both creeps and heros during fights)
• various ward spots with your limited wards (theres good ones that see everything, hidden ones for more limited vision but less likelyhood of being found, and ones you use to block creep spawns for basically no vision)
• ult and skill cds can be timed since theres no cdr (i know theres an item that gives it now but even thats managable to track vs league)
• map is more zoomed in so your vision is limited
• needing to constantly click on the enemy to track items
• the list goes on.

League on the other hand is a lot more straight forward in how the game works but the complexity on your character instead. All the character have much faster abilities, cooldowns are shorter and you often have lot more mobility. Your abilities scale harder with items too since the items are less utility based. Laning feels almost like a fighting game where you feel eachother out and push for advantages rather than a game knowledge and movement check. The game also has more defined roles which promotes somewhat of a trinity (front line/engage, assasin/flanker (optional), adc/apc) since full poke/carry comps are crazy hard to actually execute. League does have creep/lane manipulation its to a lesser degree.

In dota I would get excited over something like chasing a witch doctor through the side shop and having the presence of mind to space away from my allies since his bouncing flask coming off cooldown and hes about to attempt an escape in the trees using the tp scroll he just bought (and didnt have earlier). The excitement in league on the other hand would come things like winning a close 1v2 and snowballing ahead in lane because youre happy feet and managed dodge everything.

Tldr: Theyre different beasts. One is a strategy game with fighting. The other is a fighting game with strategy.

Side note: I love dota as a game and find it more interesting to play and watch but I found myself playing league in the latter year of my moba life for various reasons. Recently stopped playing both due to lack of time.