I am brand new to morse code and find it very difficult to go faster than 25/5. In about 2 weeks of training I'm still on lesson 7 struggling to get up to 25/5.
Are you making progress through the lessons ?. Learn first - speed up afterwards then . .
So, I also want practice sending and would appreciate input on the ease of learning straight key or iambic. Not wanting to complicate my learning any more than is necessary which is easier to learn on and is the skill from one transferable to the other in any degree?
The "straight key" ( up and down ) is all manual so you have total control of timings . . .
as opposed to having to match the ( setting you selected on the ) mechanism when using electronic keyers or a bug.
This means you will send what you intended to send - but the timings may be bad.
The sideswiper similarly is all manual, but you go fast by doing each next dit or dah on the opposite side to the one you just did - so a bit more to get used to and of course a side-to-side action.
So - possibly easier to get going and learn a fully manual - but easier to send bad morse - but-but you can record your morse and play it back next week and see what you think of your timings.
You can key alongside a morse training video to practice your timings.
The electronic keyers / bugs are less physical effort when you know what to do and the timings will be good - but not necessarily outputting the code you meant to send until you become proficient at keeping to the current setting.
The different actions mean that physically there aren't really any transferables between leyers and fully manual.
Most people seen to find sending easier - you are in full control of speed etc and you only have one two jobs - convert letters into code and work the keyer - at your speed.
Not much point in being able to send faster that you can receive.
Probably stopping progress through the lessons to learn keying will slow you down overall . . .