I like Oaken. Their GIC rates are no-fuss and at least as good as the competition, sometimes better. Their web interface is functional but nothing more.
EQ are fine as well.
Haven't had dealings with the other two.
Yes you should be declaring interest. Anything under $1 nobody cares, but under $50 you don't always get a T slip - if you don't you should be totting up the amount and declaring it, yes!
You might want to look at Tangerine as well; they often have promo rates going. And you can get a sign up bonus (ask me for an Orange Key if you care), but if you're looking for a one stop no faff with 3-month-specials-dropping-to-crap... stick with Oaken.
You could do pots in short term GICs at Oaken, rather than having separate accounts. Or just keep a spreadsheet!
(
https://www.tangerine.ca/en/ 48322202S1 is my key, you get $50 I get $50 if you open and deposit at least $250 within 60 days... Current savings offer is 2.75%)