Now when I say ab-wheel, I mean full, standing ab-wheel rollouts (not on your knees).
I can do a full ab-wheel rollout with a slight bend in my arms but to me that doesn't count - I feel your arms need to be straight through the whole process (roll out, then roll in).
For L-sit, I don't really train it often but I can hold it for 10 seconds (using mini-paralettes).
Since most know more than me on this forum, what do you recommend, train full blown for a long L-sit hold or stick with the stand ab-wheel rollouts?