Re: Which of these, or any pedal, would you recommend to a begginer?
Of the pedals you're trying out, I would go for the TRex--the Dano FAB seems overpriced to me--it was a $15 pedal NEW. Lucky, since you LIKE TRex, and even better--it's a reasonable price for a beginner's pedal.
There's not much you can't do with the pedals from the mainstream companies: Boss, Ibanez (Maxon), MXR, Digitech/DOD and Electro-Harmonix. If you look at the pedal boards of the touring pros, you'll see their boards full of these brands, and not too much from the boutique, small builders. I think E-H right now has at least FIVE small-box OD/Distortion/Fuzz boxes, all for less than $70 Street Price, and they are all terrific sounding pedals. Boss probably has seven or eight; there are several versions of Tubescreamers; MXR has several, and on and on. There's a lot to choose from; it can be over-whelming, even for an old pro like me.
I gig with a band and do all kinds of music. My board has a Boss tuner, compressor, phasor, chorus, DD-3 delay and harmonizer; DOD preamp, Real Tube overdrive, a really old Crybaby wah, and a Rocktron Short-Timer delay. I play through a Mesa Mark V, so I have a range of distorted tones from my amp. I have an acoustic guitar board with another DD-3 delay, DOD chorus, MXR 10-band EQ and a Fishman Aura DI direct box. I have a drawer full of pedals from Boss, Digitech/DOD, BBE, MXR, E-H; a Vox Clyde McCoy Wah-wah AND a new Crybaby Classic. I've hung on to an old Peavey Accelerator Overdrive that I bought 30 years ago for $20, even though I RARELY use it these days--why? Because it is the best damn pedal I've every used for slightly distorted slide guitar tones. Absolutely phenomenal. Sucks for single note lead playing, LOL, but just kills it for slide. My board has been pretty stable for the last 20 years with only a few substitutions.
So, if you do this for a career, you are probably going to acquire a bunch of pedals. You will have some life-long favs, and you will make some mistakes along the way. Your tastes will change. The music will change--Heavy Metal will die out and be replaced by kilt-wearing polka bands. And the technology will change. (Maybe not for the better, either.) Enjoy the journey.
So keep gathering information, and play as many as you can. I tend to stick to the classic brands; I know if other pros can make them work, I can too. Nothing wrong in buying boutique, but you can spend a ton of money chasing tone, and never be satisfied. (Life Tip 103--the "satisfaction" part comes from within, not how many toys you have.) If you're thinking about doing music for a business, then common sense tells you that you have to keep your costs and inventory under control, so budget wisely.
Happy hunting!
Bill