[docs] clarify which routers have SSR support

site/content/faq/900-is-there-a-router.md

@@ -4,10 +4,10 @@ question: Is there a router?
 
 The official routing library is [SvelteKit](https://kit.svelte.dev/), which is currently in beta. SvelteKit provides a filesystem router, server-side rendering (SSR), and hot module reloading (HMR) in one easy-to-use package. It shares similarities with Next.js for React.
 
-However, you can use any router lib you want. A lot of people use [page.js](https://github.com/visionmedia/page.js). There's also [navaid](https://github.com/lukeed/navaid), which is very similar. And [universal-router](https://github.com/kriasoft/universal-router), which is similar as well, but with the concept of child routes.
+However, you can use any router lib you want. A lot of people use [page.js](https://github.com/visionmedia/page.js). There's also [navaid](https://github.com/lukeed/navaid), which is very similar. And [universal-router](https://github.com/kriasoft/universal-router), which is isomorphic with child routes, but without built-in history support.
 
-If you prefer a declarative HTML approach, there's [svelte-routing](https://github.com/EmilTholin/svelte-routing).
+If you prefer a declarative HTML approach, there's the isomorphic [svelte-routing](https://github.com/EmilTholin/svelte-routing) library.
 
 If you need hash-based routing on the client side, check out [svelte-spa-router](https://github.com/ItalyPaleAle/svelte-spa-router) or [abstract-state-router](https://github.com/TehShrike/abstract-state-router/).
 
-[Routify](https://routify.dev) is another filesystem-based router, similar to SvelteKit's router.
+[Routify](https://routify.dev) is another filesystem-based router, similar to SvelteKit's router, but which is less performant on the server because it relies on JSDOM instead of Svelte's built-in SSR support.