Either will suit your purpose. Many folks (myself included) use HC110 as a one shot, mixing various dilutions from the syrup itself. I use it exclusively for HP5+, at 1:63 for 12-14 minutes. A marriage made in Heaven. The syrup itself lasts for years. For Pictorial use, this combination is hard to beat. Here's an example, taken in 1984 with a Nikon F3 and a Nikkor 85mm f2 lens. HC110 would be my choice for pictorial use, even over D76. At this dilution it has very smooth graduation and high acutance. This is a scanned 5x7 print on Luminos paper, Y surface. Real vintage stuff!
I use a lot of Rodinal, too, mostly at either 1:25 (FP4, TMax 100) for pictorial and portrait use in low contrast situations: (Exakta RTL, Auto Aragon 100mm f2.8 lens, 1/20th at f4, FP4 in Rodinal 1:25), scanned 8x10 print on Ilford Galerie
or 1:50 (Fomapan 400, Tri-X). I use these ASA 400 films with Rodinal when I want maximum impact: (Konica Autoreflex, 50mm f3.5 Hexanon macro, 1/125th at f5.6, Tri-X in Rodinal at 1:50, scanned 5x7 print on Arista 5x7 Grade 3. This is a lumber kiln in Prince George, BC
Remember that different developers have different effects on different films. Then impact of Rodinal and Tri-X is exceptional. In Rodinal, HP5 is not nearly as pronounced.
In addition to these two develpers, I also use Xtol, especially with T grain films, and D76, which I like with FP4 for landscapes in medium format.