My Multi Tech II is pretty upright, Captaincake your car must have really flat seats if the Multi Tech II is too reclined!
I do love our Multi Tech II, my daughter will be 5 at the beginning of April but is under the 9th centile for both height and weight and she's really comfortable in it.
The TWE is more versatile, it will fit practically any car and of course it's not a problem if there are storage boxes in the car because there is no support leg. It can also be installed set back from the car's seat backrest to give more legroom. It can also be used forward facing with the harness to 25kgs, and will accommodate a slightly taller child than the Multi Tech II.
The Multi Tech II has no recline adjustments or option to fit it differently for increased legroom. It also has the support leg, which can be a problem (you should check the manual of any car with storage boxes, sometimes you can extend a leg to the bottom of them and some manufacturers sell fillers although Britax won't usually allow a foot prop to rest on the lid of a filled box). But it's simple to fit, and has a good supportive headrest if your daughter occasionally still sleeps in the car. Both seats have side impact protection but there is no headrest on the TWE. If you want to use the Multi Tech II forward facing it's harnessed to 18kgs but from 18-25kgs it's a high backed booster. I'd never use it like that, it's so heavy that I'd not want that unsecured weight behind my daughter in a collision.
The TWE is usually recommended for tall children, or for use forward facing for heavy children (because of the increased harness capacity). Your daughter doesn't fit either of those categories, but that's not to say you shouldn't buy it.
There isn't a fitting list for the TWE, but you could check the list for the Multi Tech II to see if your car and your family's cars are on there.
The photo attached is of my daughter last summer in the Multi Tech II, she's not grown a great deal since then, she's comfortable in the seat and has never moaned about her legs or anything. I'm keeping her rear facing in this seat for another couple of years.