bryton rider 35 question

I'm in 2 minds whether to get Bryon 35 or 50. I searched net and can't find answer to few questions. On the 35 is there a max distance for the planned routes you can upload to unit. Also is there a maximum number if waypoints on it? Has the 50 go the same altitude information that the 35 has?
2016 diamondback heist 2.0
2015 giant propel advanced 1
2015 Genesis day one disc ss
2014 giant roam 2
2015 giant propel advanced 1
2015 Genesis day one disc ss
2014 giant roam 2
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2015 giant propel advanced 1
2015 Genesis day one disc ss
2014 giant roam 2
I've not noticed maximum distances on any route I've tried to plot on either the 35 or 40 though in the past software glitches (now fixed) did limit distances to a degree that the functionality was effectively useless.
There is barometric altitude info on both units as PK1 says but I think it is pretty innaccurate compared to the digital terrain map info of the routes as plotted online.
The 50 is a very functional and effective unit when you need good navigation functionality but it is a bit bulky IMO for the majority of the time when you don't need it. The basic breadcrumb route the 40 gives works pretty well though the displayed scale varies a bt and sometimes goes to a small scale just when you need the detail! I tend, when using it, to expect the odd place where I take a wrong turning for a few yards and have to turn round - but I still prefer it most of the time to the 50.
As it happens, I've used the 50 in The Netherlands without base maps and it was barely harder to follow (and in some ways easier!) than with the base map. The presence of basemaps is mostly over-rated.