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Putting nothing actually isn't always bad these days. If the pages are clearly unique, Google can create a snippet with no trouble. In fact, they often do this anyway (regardless of your META description). Most people prefer some control over the snippet (you never have total control), but I've seen cases where leaving a META description off worked fine. There really isn't much benefit to going beyond the length limit - it's not a ranking signal and Google will only display up to the limit. If you had a long META description, it's possible Google would display a middle section of it if that matched the query, but in most cases I wouldn't bother. You're just using up load-time for something very low value. Presumably, that text is also on the page somewhere. All of this is to say that, while I'd lean toward the truncated version, I don't think it's cut-and-dry. I'd actually say the long version is my last pick in most cases. As @Boomajoom said, it could be a spam signal (although probably only if its keyword-stuffed).

Thank you Ryan, your answer is really detailed and I am going to stop checking for my domain authority for a while, and thus keep more energy for finding other links ! Loïc

Great, that's perfect for me then Loïc

I would Aim for 155. Just being picky but I believe this is the recommended amount. Hitting the 160 mark might see you having the ellipsis (...) in your meta description.