Hi Evy
I use koch as my first choice for natal and transits. I've tried a lot of them and this is the one I found right with most people I observe.
I sometimes will look at placidus but it is my second choice.
I know Linda used the equal house which is easier if you are calculating by hand. I wonder if she still would given that computers do the leg work. I would be inclined to use Equal if it was calculated from the Zeneth rather than the Asc.
I've tried the whole sign, which is great if you are born early in a sign but if your Asc is mid to late sign it doesn't resonate.
For horary charts I still to the traditional that William Lilly used in 1600's Regiomontanus. It seems to work ok but I wouldn't use it for natal, synistries or composites.
I've not really worked that much with some of the less used house systems.
hope this helps
Love
Lis