The secondary mirror spider of my cheap 8-inch Dobsonian is constructed as in Fig.1 (front and side views, omitting the mirror and its holder and mounting bolts). It offers little resistance to twisting about the optical axis.
If the spider were constructed as in Fig.2, it would be even cheaper, due to fewer parts and simpler shapes. But it would be torsionally stabilized. And it would still produce only four diffraction spikes at right angles (provided that the bolt heads are within the central obstruction).
This idea is hardly new. It is almost stated in Bely (ed.), The Design and Construction of Large Optical Telescopes, Fig. 6.32 (https://t.co/JlhUyVpyE1), and is an obvious vaned equivalent of (e.g.) Steve Houlihan's wired spider (http://t.co/Y3GrMtEHLt).
I merely express my surprise that the simpler superior structure is not seen more often than the more complex inferior one.