No expert, but my experience has been that tillers create lots of weed problems after the initial bed creation. Having said that, yes I have a 30 year old Troy Built that runs like a champ, and is still used quite often.
My approach for raised beds is a garden broadfork to loosen the soil prior to Spring planting, and keep earthworms happy and weed seeds buried. A Hori-Hori for hand digging, and a push pull weeder for emergent weeds.
I can't verify this, but I've been told horse manure has high seed content since there is less digestive time than with cow manure. But gardeners around here don't generally use uncomposted horse manure in their gardens. Maybe somebody else can comment on this.
Weeds are going to grow, but I try to get them early before they head out and repopulate. The 3 tools above make that easier for me.
Hope this helps.
