Probably better for most. The hands are in a more natural position (thumbs straight ahead), with the body lifting in a more upright position. With regular straight bar DL's the body tends to lean forward to avoid touching or hitting the knees. This leaning forwards puts more unneeded stress on the lower back. Rounding the back is also another element of this style of lifting. Any or all of this may lead to serious injury over time. If the lower back/hips are not lined up correctly than the knees can also be affected. Anyone can experiment with different lifting styles (sumo, wider grip, etc) to see if that may ease lower back/knee tension. In return, giving a smoother style.
Some guy's are natural DL'ers and may have less or no problem with the knees or leaning forward too much. Seems mostly lifters with shorter legs/trunks fall into this class.
The diamond/trap/shrug bar is excellent for those less blessed when preforming the DL. The SLDL or Romanian DL can be a replacement for standard DL'ing. And will help the squat greatly. These two movements strengthen the hams and lower back, as well as the lats/traps. Remembering that regular floor DL's get most of the power from the legs/hips/lower back when pushing off from the floor. The arms and upper body are holding the bar in place during the lift only.
If you more into PL'ing, than regular floor DL's are a must in your training. If into BB'ing, having an overwhelming desire to do DL's, than do them off a PR, setting the pins around Knee height. Can also use training boxes, planks, heavy blocks, etc. Most any form of DL'ing is an excellent upper body mass builder. When getting into serious intent DL'ing the lower back usually becomes the weaker link. Lifting from around the knee height (rather than floor) can reduce that quite a bit for most men. And much more weight can be lifted from that pin position. Good Luck.
