Where the two answers come from
The classical scheme had seven visible planets and twelve signs, and it distributed them so that every planet except the two lights took a pair of signs. Mars received Aries and Scorpio. That arrangement is symmetrical and it held without challenge for a very long time.
Pluto was identified in 1930, and astrologers of the period assigned the outer planets to signs whose descriptions seemed to match them. Scorpio, with its associations of depth and irreversibility, went to Pluto. Neither assignment cancels the other. The older scheme stays intact, and modern practice usually treats Pluto as the primary ruler with Mars retained as the traditional one. Aries kept Mars outright, so the classical pairing was broken on one side only.
What the choice actually changes
It changes which planet you look at when you want to read a Scorpio Sun in context. Under the traditional rulership the condition of Mars in the chart, its sign, its house and its aspects, informs the reading of Scorpio placements. Under the modern scheme Pluto plays that role.
In practice a great many people use both, which gives two dispositors rather than one. That is not a fudge. The two planets move at completely different rates, Mars taking about two years to circle the chart and Pluto a couple of centuries, so they describe different timescales and different orders of concern. Which one is doing the work in a given reading is a matter of technique, and it should be stated rather than assumed. A page that names a ruler without saying which scheme it is using has skipped the only part of the question that has an answer.
The layer below the sign
On 8 November the Sun sits near sixteen degrees of Scorpio, running between about 15.2 and 16.5 at noon across 1930 to 2035. That places it in the middle face of the sign, from ten to twenty degrees, and the face carries its own attributions independent of the sign ruler.
The Chaldean order gives the face to the Sun. The triplicity count gives it to Pisces, and therefore to Jupiter traditionally or Neptune in modern practice. So a Sun at this degree answers to a Mars or Pluto sign rulership and to a solar or Piscean face at the same time. That is a good deal more structure than a sign label carries, and it is the sort of thing that tells one Scorpio birthday from another. None of it depends on the ruler dispute, since the faces are drawn by a separate scheme entirely.
What none of it settles
The rulership question concerns the sign, and the sign here is the same for everyone born on the date. Nothing in it is personal. The placements that differ between two people born on this date are the ones the calendar cannot reach.
The Moon changes sign every couple of days and will have two or three candidates on any 8 November. The Ascendant depends on the local horizon at the minute of birth and can be any of the twelve. Both of those need an hour and a birthplace, which the widget above takes, and both of them do more to distinguish one chart from another than the identity of Scorpio's ruler ever will.
Questions people ask about this
Does Mars or Pluto rule an 8 November Sun?
Both, in different schemes. Mars is the traditional ruler of Scorpio from the classical seven planet arrangement, and Pluto was assigned to the sign after its identification in 1930.
Is one of the two rulers wrong?
No. They belong to different systems rather than competing within one. Most modern practice uses Pluto as the primary ruler and keeps Mars as the traditional one alongside it.
What degree is the Sun on 8 November?
Close to sixteen degrees of Scorpio, with noon values between roughly 15.2 and 16.5 across the modern range. The widget above narrows it to a single figure.
Which face does that fall in?
The middle one, ten to twenty degrees. The Chaldean order attributes it to the Sun, while the triplicity scheme gives it to Pisces and so to Jupiter or Neptune.
Does the ruler affect my sun sign reading?
It affects which planet you read as the sign's dispositor, which changes the timescale of the interpretation. It does not change the sign or the degree, which are the measurable parts.
Is the sign in any doubt on this date?
None at all. The Sun is deep inside Scorpio, with roughly a fortnight to go before the Sagittarius crossing, so no year or hour changes the answer.