I honestly don't remember what shell you're in. I think it's the first shell whose name I can't remember.
* The shell that I did Einherjar with once has a few people I like, a few people I don't know, and a few people who think they're much better at the game than they are (which is normal). I haven't thoroughly investigated their rules, but I seem to remember it being much much more in to wealth redistribution and mandatory events than I'm game for. If you take a linkshell to do KS99 Wyrm, for instance, it should still be Your Pop Your Drop. Pop item included and sellable, and nothing obligatory linkshell property. If you go to kill Fafnirs, your linkshell members should be able to sell Honey Wines that drop off their pops, etc.
* SND has shown themselves to be a big pile of fail in pretty much every one of my interactions with them. I think I was on the server for less than a day before they stole an Ix'Drk from me with a party (I sac pulled to a tower to depop the adds) and ended up wiping to it (because they re-linked the adds and couldn't figure out how to handle it). Reclaimed, got a stupid deed, and they just cost me half an hour and some annoyance. Way to set the tone, guys.
* Blueprint is just starting up. I haven't done anything with them yet but recognize some faces from Duvetecca.
* Div is still okay. That's the only Garuda shell that's "still going" but I'm pretty sure it stopped being an event shell and dropped to social status for quite a while. They're also mostly JP, though they had some dedicated "wwww" NAs for a while. I'm not sure if Pyo is expanding it again or what. I've heard only good things about him, but some of his linkshell members always rubbed me the wrong way.
* I'm not sure what happened to Stellvia. I assume they disappeared or merged with Div or something.
* With Shumo's troubles and various other key members disappearing, TheTroupes faded off about two months ago.

Of the linkshells above, only the top two have enough members to do Voidwatch without inviting out-of-LS members. The next two can get Voidwatch done without shouting, but they typically invite random non-members. I'm personally in a nebulous group below the bottom of the list that's basically a collection of a few NAs from Garuda who get together irregularly to do Voidwatch and end up shouting to fill the last 8 slots. I have Ashen/White top tier Abyssites and all the periapts, but it isn't like I can reasonably expect to ever get a Voidwatch body. In fact, I can make a pretty safe bet that I'll get a level 95 Empyrean and Mythic before I get a voidwatch drop that I give a shit about.

To be frank, I haven't found an 18 man linkshell that suits my tastes in years. The average player is so bad and player commitment is so low that leaders sacrifice player quality for the equally-important stat of attendance. This has always been the case, but it's even worse now that there are fewer people in endgame to choose from. Before the server merge, I had listed out the endgame NA players that I approved of and it basically added up to one alliance worth. Many of them have quit since then.