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So, the at the base cost of 70 pts for both, a dreadnought comes with +2 S/T/W/A, +1 Ld, and -10 M compared to a landspeeder.

Any other weird discrepancies in other places/codex? Is having 10" added movement worth all of those upgrades?

Well a speeder flies. Unless your meta is full of hydras that is an advantage.
But yeah speeders are a bit pricey.

The base cost of the model isn't really important. What matters is the final cost for all the options. And I think the cheaper dreadnought is more expensive than the cheaper Land Speeder.

A dreadnought is far more expensive than a landspeeder. I don't think you can get a dreadnought for less than 130 points.

While I don't subscribe to normal mathhammer, I'd look at a couple of things:

1) Landspeeder has the Fly keyword - ignores models/terrain for movement and can leave close-combat and still shoot.

2) 16" move increases the lethality of its best weapon (Multi-Melta)...but the Multi-Melta is a bit crap anyway so that's subjective value. It does give the Landspeeder the ability to get in half-range and benefit from the melta special rule, far easier than a dreadnought.

3) The dreadnought will benefit from the chapter trait, where a Land Speeder does not (that I'm aware of).

4) The Land Speeder only has heavy weapons, so using its Movement (its real benefit) is difficult. You likely don't want to sit in a spot and trade shots with something.

5) The Movement does allow a missile-launcher Land Speeder to keep out of range of some threats on the table...but again sacrificing some shooting ability while doing so.

I'd argue the Land Speeder is "okay", where a dreadnought is probably "good".

One interesting thing about Land Speeders is their potential assault range. A squad of 3 has a 20" move prior to a 2d6 assault. If you really needed a shooty unit to not fire next turn, you could charge it from practically accross the board.

Dreadnoughts are defiantly more survivable and having access to the chapter traits can make a big difference.

However I love running my Speeders in a squad of 3, each with dual heavy flamers. Using the flamers fixes the whole "moving and shooting heavy weapons" thing and the speed allows you to always get into range. Makes for an awesome 'chaff' clearing move, but don't expect them to last past a turn or two.

No dual heavy flamers anymore. SAD.

It's dissapointing, I know, I had converted some too.

Dual heavy flamer is still an option. It's in the Index, and per the Designer Commentary it's still legit.