Hard to say because or was a fair few years ago I did it and things change, but Luton (near Chatham) I was told by a mare living there was rough, as in don't go out alone daytime or at all after dark. Some areas of Kent are a bit "you're not from round here you're not one of us" and I'm white, as were most there. Pubs that go silent when you walk in while everyone stares at you (not all of them, I used to drive to an isolated village pub that was friendly, the noisy town centre ones could be ok too it was hit and miss). People (not all of them) staring in the street if you're not wearing the same style clothes as everyone else (tracksuit (under 40) or pleated skirt and beige anorak (over 40) seemed to be the choices to avoid stares, unless you were on a night out drinking). Lots of nice people who didn't behave like that, but those who weren't so nice had a vibe of intolerance. This was in a small surburban village right next to a town.
If you don't already, learn to drive. Even in my town the last bus to suburbia stopped running at 6pm and in little (think 3 roads, 20 houses, a few farms and a pub) villages a few miles outside outside town, the bus went to town on Tuesday and returned on Thursday, no joke. One town wasn't next to another, there were stretches of countryside in between, so you'll be wanting breakdown cover for the car.
Work was not so plentiful but I never had any troubles finding some, wasn't picky over jobs/wages though. Public transport was a lot more expensive and if you're reliant on it for work it's going to limit you regarding location. A lot live there and commute on a fast train to London, which costs massively, but is offset by a cheaper mortgage or bigger house for your money, and getting the train so far out at least you got a seat. You can't pick up temporary work on repeat as a way of earning a living, like you can in London. Temporary work was for people who only wanted to work sometimes and weren't relying on it. Wages are lower than London but excluding rent/mortgage and council tax perhaps, cost of living is pretty much the same. It's not a great place to be poor.
M2/A2 and M20/A20 were fine for driving back to London and there's a few points where you can switch (via an adjoining road) from one to the other in the event of some disaster and tailbacks. You can also follow the A2 all through the towns instead of flowing into the M2 if necessary, it runs out near Canterbury I think.
Doesn't have the same vibe as London. If you think London is too dirty (Kent air is cleaner, you can smell London for the first little while whenever you go back!), too hectic or fast paced and the people too shallow, but you like the countryside and relaxing, you might like Kent better. You'll know your neighbours names! And they'll probably be friendly. Not so many big parks and public open spaces though for walking, horses or cycling, it's more muddy footpaths across fields or country lanes to wander around. Your wardrobe will be fine in terms of warmth for 90% of the year.