RS-485 Stub Connection Best Practices

Without going into too much math, I'd say keeping the stub length shorter would be better because it would reduce transmission line effects:

Data transmission lines should always be terminated and stubs should be as short as possible to avoid signal reflections on the line. Proper termination requires the matching of the terminating resistors, RT, to the characteristic impedance, Z0, of the transmission cable. Because the RS-485 standard recommends cables with Z0 = 120 Ω, the cable trunk is commonly terminated with 120-Ω resistors, one at each cable end (see Figure 5, left).

Source: www.ti.com/lit/an/slla272c/slla272c.pdf

So use the Stub Starts at connector option, this means tying the bus at the pin and not using a splice. Keep capacitance low to improve bus performance.