I agree with Trice's comment and some others.... natural selection will determine which site's survive & prosper & which ultimately bite the dust.
This site offers responses to detail questions regarding anything and everything --- restoration, mechanical problems, cosmetic issues ---- whether for daily driver or trailer queen 113's and everything in-between. ... and as others have pointed out it's get's responses and questions from entire globe (though I haven't seen many posts (queries or responses) from Germany).
What it lacks are comprehensive guides on a given subject... though there's been some effort made in this direction, it's still hit/miss. Putting such things together requires more, I'm afraid, than just casual volunteer effort, or if a pure volunteer effort, then the approach has to be carefully directed and coordinated, edited, proofed, and cross referenced... none of which is a minor voluntary undertaking.
Another aspect I find somewhat lacking --- or hap-hazard --- on this site is that identification of precisely which models and within models, which chassis numbers are subject to a given response in answer to a given question. I have found (owning an earlier '67 250SL --- before the major changes to accomodate the new US DOT requirements), many responses apply to a 280SL but not the 230SL, and the inverse situation. This leads to both some confusion, incorrect answers, or to multiple answers to the same questions over the course of time (as not every member looks at every post every day 2x per day to provide an answer to the multiple questions).
There is no such thing a "perfect" W113 resources web-site... but this site despite some of it's shortcomings is as close to the unobtainable goal as any W113 site on the globe (my limited opinion, of course).
This site can, has, and will continue to improve with time and the dedicated, selfless efforts of many that contribute to it.
That being said, however, perhaps the focus of effort going forward in time should be to find a means & organizational method to put some of those features that have been started or partially done (the comprehensive ones, in particular) into practise. I provide, as an example, an article I recently saw on Spencer's OurSL site (Burlingame CA) that describes in pictures and words how to inspect the area's behind the rocker inspection panels, under the rocker covers, replace any rusted metal, and purchase prices for replaced covers (inspection and rocker covers). While a few additional details & pics could have added for a complete DIY effort, it was as good an article with relevant pic's on this particular (and oft necessary & required) subject as any I've seen. Unfortunately, this article is only viewable if you're a paid subscription member to Spencer's OurSL site. The value (besides the content itself) was, however, that the subject was limited to one particular condition/job/topic, and that it was clearly labeled with that subject: "280SL Rocker Repair".
Longtooth
67 250SL US #113-043-10-002163
'02 SL500 Sport