Lua is used more widely for scripting, so there's a lot of knowlege and third-party systems for making integration easier. For myself I'd actually prefer javascript (ecmascript, actually) -- there's nothing wrong with Lua though, I just feel that ecmascript is a more useful skillset all-around. Unfortunately the knowlege and tooling for integrating v8 isn't really there, so you're on your own for the most part. To its benefit, ecmascript is also easy for people with a background in flash or front-end web development to 'transition' to, which could be a way to differentiate your engine from all the rest.

I'm interested in the same topic and made some research.

First of all, v8 is faster than pure Lua but slower than LuaJIT. I know that both Lua and LuaJIT successfully implemented in different engines and games. I haven't heard of a decent engine\game that implements v8 though.

Lua is a very cute language, I had some experience with it. Its widely used in games, so there should be a lot support for it.

JavaScript on the other side is getting very popular now because of web developers who uses it, node.js. So consider this if you are planning to find people who have experience in JavaScript. However there are no documented experience of using v8 as a game scripting language, so consider this as well.

my 2 cents

Here is what I read

http://create.tpsitulsa.com/blog/2009/01/29/v8-objects/

I think its the closest article to game dev I found when I looked for this topic.

Of course you have the original Google tutorial

https://developers.google.com/v8/embed

One of the big plus points of Lua is that it's extremely lightweight, much more so than any JS engine. That combined with the easy deployment and reasonably good integration support make for a compelling package.

Nanook,

Node.js is just a software platform written in C, C++ and JavaScript. The core of node.js is written in C and C++ with bindings to JavaScript. And yes, it is possible to create a web server entirely with node.js. I'm not going to say you should do that before I'll know what your needs are.

As for scripting, I wanted to create scripting engine with JavaScript, simply because I love JavaScript, but I assume its easier and more common to use Lua because it was already tested and proved to work. And I agree with previous comments, Lua is very lightweight.