How would Earth be if our Moon was replaced with Titan

Titan is 9 times the mass of Moon. That puts the combined mass (Earth+satellite) at 1⅟9, instead of 1⅟80 that is now with the Moon (a ratio of 1/0.91125). In place of 29.53 days in a month its period will be 28.19 days (=29.53 √0.91125). it would also appear with diameter ¾º, in place of Moon's diameter of ½º. At that distance it will exert a pull so great that the tides would make all coastal areas inhabitable as the waves at the time of rides, would go several miles deeper on to land.
Even the Atmosphere would develop a prominent tuft on top (directly under Titan) that sweeps in the wake of Titan like permanent, yet moving tornado.
Frequency of Eclipses would be enhances too. Solar Eclipses would last shorter (actually it would last longer a bit, but with more speed, it sweeps the shadow much faster) on a larger area, but with prominent & significant Halo around the dark disc. There won't be any Annular Solar Eclipses like with Moon. Lunar or rather 'Titanic' Eclipses would be like same. Titan when placed that proximal to the Sun (⅟10ͭ ͪ ) would lose much of its Atmospheric fuzz due to 100 times increased Solar irradiation; that throws up the question 'how much of its Atmosphere would remain?' (that is also a significant part of its mass)

Yes, in actuality probably a devastating gravitational tug resulting in the deaths of billions, or worse, as the oceans suddenly rise up and flood the Earth, our air is tugged from the atmosphere and we fly towards our new neighbour, screaming and burning as we go.

Not a direct answer to your question, but the video below shows what it would look like if other planets were at the distance of the moon.

Tides would be bigger. It would appear slightly larger and brighter. Neil