and
are worlds apart in my opinion. I actually think over the last few months Sona has really, really fallen out of meta, and for good reason, she's just too squishy and vulnerable to be played bottom. Rakan is one reason why. One bad initiate and its completely over for Sona. The ONLY thing Sona has going for her right now is some of the best Sustain in the game. Sure, the burst is there - but that's pretty common on supports these days. If your going Sona, playing with lategame scaling in mind is important, in my opinion. I also really, really don't think she's capable of 'carrying' a game in an honest sense... her CC is just not good enough. She can't really stop hard burst unless she has her ult, and that's a problem in today's games. I wouldn't pick her in the current meta. Pro's agree too - you just don't see Sona in the higher tiers of play right now.
Conversely, Karma brings so many more tools to the table, you can engage, you can shield, you can burst, and you can poke. I feel like her kit is very strong and yet well rounded. Her AP Scalings are insane, and she has some of the best burst among support bottoms, its like some big secret, Karma has all these great tools, but her damage is absolutely terrifying. I have died so many times to a GOOD Karma because i completely underestimate how much damage she brings. Her shield gives her enough agency to save someone in burst scenarios, doubly so if you build for it. You can find tons of youtube videos of Karma and how to build/play her. The only issue here, is karma is pretty popular and arguably on Riots radar for balance tweaks, she might see a nerf or two down the road.
As for Support items... well..... I told myself i wouldn't do this but here you go:
This is underwhelming at best. I'd advise you to stay away until it gets buffed.
Bread and butter support item. - I buy this item every game and turn it into the warding variant. The recent patch made it even more busted. I expect it might be nerfed. I also expect to start seeing it mid-lane, somehow. (The quest is very hard to do if your mid.)
It's alright. If your playing a meat shield and want to be durable, this is your go-to.
Required. Get it early.
I get this every game, generally - it's too important for vision control. Doubly so when you don't trust your team.
Late Game:
Banshees is about to hit the meta in a big way, its one of the best items for AP anything since the patch - Supports should eat this thing up. Makes it a lot harder to be engaged on.
If your ADC is carrying the game, this is a pretty good buy - its underrated.
Still probably one of the best Anti-mage items in the game, I buy these when I notice an AP carry is getting fed on the enemy team.
Most supports will tell you this is required, but I humbly disagree - it's popular, its insanely good, but I think a bit overrated. If your NOT good with actives, I'd caution you, because that's easily the biggest draw here.
Still the single best AP item in the game right now. Though I think new Banshees is going to replace this.
Underrated. One of the better items in the game, but the active component is easily the most important feature here. Only get this if you know you can nail the active.
Very popular. Very good. Hard not to recommend this, though I don't really buy it when I play.
Much like Zeke's, this is a great investment if your ADC is carrying you, otherwise, discard. I need to be 'Wowd' by an ADC before ill consider purchasing this. It DOES help the ADC survive, but never as much as you THINK it would.
This is one of the best items in the game. It's viable on almost every champion, except maybe ADC? I buy this to survive fed damage people as support, it has NEVER failed me. This thing is nuts. This is your go-to defensive option when they have a carry or all-melee team that gets fed. Use and abusive until they nerf it, because its coming.
That's about all I can think of on the support front for now.