many clients ask for a typo3 website because typo3 is almost synonymous for CMS. If I suggest silverstripe to such client, he wants to know what is better about silverstripe. For sure the backend is much more clean and has better usability. But what else? what are the things that you like more in silverstripe than in typo3?
It would be good to have at least 3 very good points to convince the client :)
Typo3 might still be popular in German-speaking countries, but elsewhere it has lost a lot of its appeal and its marketshare is in decline.
Haven't really used Typo3 b/c the only time I tried it, it was so buggy I couldn't get through the installation phase. Probably it's better now.