Each players opinion of reeds is very personal. Identical mouthpieces may have small differences inside and out caused by wear and tear or manufacturing and everyone's chops are in a consistent state of flux, especially in the first few years. The weather has an input on the quality of the raw product, and given the variables in growing, drying, processing and storing, it's not surprising there is variation in the finished product. Here's where I'm at.....today.
I'm a bit of a butterfly with alto reeds. I currently have in the alto case, Vandoren blue 2.5 & 3, Rico Jazz select, Rico Hemke, Rico Royal, Gonzalez RC and Vandoren Juno. I always seem to come back to Vandoren blue. They're always OK and sometimes marvelous.
There's usually variation in a box of reeds. With Vandoren blue, sometimes the 2.5 is a little on the soft side and the 3 is a little on the hard side, but when they're right they suit me fine. I buy in three packs or a half box of 5. If they're not right you don't have too many to sort out.
Looking on a reed comparison chart the Hemke 3 sits in between a Vandoren 2.5 and 3. It's a French cut reed like the Vandoren Blue and they come in a box of 5. They're never marvelous, for me, but they're very consistent and very playable. If I'm having trouble with the Vandoren I stick one on and away we go. No magic, but no problems.
Rico jazz select, also French cut, use a different numbering system. I'm trialing a box of 3H. They're quite consistent and playable but for me, no magic.
Rico Royal, French cut again, use numbers for strength. The difference between numbers is a little closer than Vandoren. The 3 compares with a Vandoren 2.5 but as you go up a 5 is a little softer than a Vandoren 4. Again consistent and playable but no magic so far.
Gonzalez RC. The RC stands for regular cut. I ordered them by mistake. They're a little tough to start off with but they play in quite quick. I like to use these with a trad front line. You can lean on them to play very loud with little distortion and when played in they'll whisper and subtone. Nice full tone at the top of the range of the alto. They're very cheap, taste great and last for ages. I'll try and order the French cut next time Doh!
The Vandoren Juno was introduced to compete with Rico orange. It's about the same.
Reeds are the sax players cross to bear.