Thanks guys for all recomendations

I've been searching about this Kobo. And I'd like to have your opinions hahah I won't buy many books on Amazon. Actually, I don't want to buy any. I want to have an e-reader for three reasons: Easier to carry, beter to expand my english vocabulary and to principally to save money, downloading. Also, it's easier to find old books and classic ones.
Anyway, you guys who owns a KOBO and a KINDLE. Which one you prefer?
I won't use too much of this Amazon universe, as I see it. For example, can I see the books I transfered via USB cable in my pc Kindle and cell phone app? Will it have the same functionalities that Amazon books have?
And finally, does KOBO have the same functions Kindle have? As example, I mention the dictionary
THANK YOU , GUYS!