A signature script needs capitals that read at a glance, joins that never break, and enough irregularity to look written rather than typed. That rules out unjoined faces and the most ornate calligraphy. Allura and Alex Brush satisfy all three; Mr De Haviland and Mrs Saint Delafield look like a hand that has signed the same name a thousand times.
Preview your own name
A signature is judged on its first letter, so preview your own name rather than a sample, then adjust the slant and weight on the signature generator until it looks like a hand rather than a font. It exports a transparent PNG at 300 DPI for letterheads, email footers and documents. The result is a design asset, not a legal signature; the block below explains the difference.